Jakob Kjellberg

Gormsen, J., Gögenur, I., Kjellberg, J., & Helgstrand, F. (2026). Long-Term Healthcare-Related Costs Eight Years After Laparoscopic Roux-en-Y Gastric Bypass and Sleeve Gastrectomy: A Nationwide Register-Based Study. Annals of Surgery Open, 7(3). Advance online publication. https://doi.org/10.1097/AS9.0000000000000711

Christiansen, C. B., Suusgaard Kjølhede, J., Hashiba Jensen, M., Lamberts, M. K., Ibsen, M., Ibsen, R., Kjellberg, J., & Jennum, P. J. (2026). Association between continuous positive airway pressure usage and workforce attachment in obstructive sleep apnea. Sleep Medicine, 143, Article 108893. https://doi.org/10.1016/j.sleep.2026.108893

Larsen, A. T., Sopina, L., Mølgaard, J., Aasvang, E. K., Meyhoff, C. S., Kjellberg, J., & Kristensen, S. R. (2026). Impact of postoperative in-hospital continuous vital sign monitoring on healthcare costs, resource utilization and labor market outcomes. The European Journal of Health Economics . Advance online publication. https://doi.org/10.1007/s10198-026-01919-2

Jennum, P. J., Ibsen, M., Mettam, S., Markt, S., Fuller, D., Alexander, J., Ibsen, R., Kjellberg, J., & Drachenberg, C. (2026). Clinical and Socioeconomic Burden Among People With Narcolepsy or Idiopathic Hypersomnia: A Retrospective Cohort Analysis of the Danish National Patient Registry. Sleep Medicine, 139, 108690. Article 108690. https://doi.org/10.1016/j.sleep.2025.108690

Larsen, A. T., Sopina, L., Aasvang, E. K., Meyhoff, C. S., Kristensen, S. R., & Kjellberg, J. (2026). Assessing the Expected Costs of Continuous Remote Monitoring for Post-Discharge Home Use and the Readmission Reduction Required to Achieve Cost Neutrality. PharmacoEconomics - Open, 10, 365-379. https://doi.org/10.1007/s41669-025-00632-9

Nyholm, A. M., Esbensen, B. A., Westergaard, C. L., Kjellberg, J., Juhl, C. B., Olsen, B. S., & Odgaard, A. (2025). Cross-sectoral use of Patient-Reported Outcomes (C-PRO)–the effect on the cost per improvement in quality of life for patients with chronic degenerative shoulder conditions-a protocol for a randomised controlled trial. Trials, 27, Article 47. https://doi.org/10.1186/s13063-025-09329-0

Suusgaard, J., Christiansen, C., Lambert, M., Hashiba, M., Ibsen, M., Ibsen, R., Kjellberg, J., & Jennum, P. (2025). Multimorbidity patterns in elderly sleep-disordered breathing patients. ERJ Open Research. https://doi.org/10.1183/23120541.00721-2025

Jennum, P., Debes, N. M. M. M., Ibsen, R., Ibsen, M., Kjellberg, J., & Svensson, J. (2025). Morbidity and mortality from obstructive sleep apnea in children and their parents: a controlled national study. Sleep Medicine, 133, Article 106635. https://doi.org/10.1016/j.sleep.2025.106635

Strong, M. B., Farber, A., Armstrong, D. G., Azuma, N., Beckman, J. A., Bonaca, M. P., Bradbury, A., Conte, M. S., Fakorede, F., Goodney, P. P., Gupta, P. C., Hansen, C. S., Hinchliffe, R. J., Houlind, K. C., Kjellberg, J., Kolh, P., Kum, S. W. C., Nordanstig, J., Parikh, S., ... Menard, M. T. (2025). International BEST-CLI Collaborative: next steps to create a coordinated global initiative to improve awareness and access while reducing mortality and amputation for patients with chronic limb-threatening ischaemia. British Journal of Surgery, 112(8). https://doi.org/10.1093/bjs/znaf150

COVID-RED consortium (2025). Remote early detection of SARS-CoV-2 infections using a wearable-based algorithm: Results from the COVID-RED study, a prospective randomised single-blinded crossover trial. PLoS ONE, 20(6), Article e0325116. https://doi.org/10.1371/journal.pone.0325116

Jennum, P., Ibsen, R., Ibsen, M., Andersen, S., & Kjellberg, J. (2025). Long-term welfare consequences of sleep apnea in 20–64-year-olds—influence of gender: a nationwide cohort study. Sleep, 48(7), Article zsaf057. https://doi.org/10.1093/sleep/zsaf057

Larsen, C. S., Westergaard, C. L., Stærke, N. B., Arnet, U., Liu, G., Kantsø, L. R., & Kjellberg, J. (2025). Clinical outcomes among COVID-19 patients initiated on molnupiravir in Denmark: A national registry study. Antiviral Therapy, 30(1), 1-13. https://doi.org/10.1177/13596535241313244

Jennum, P., Sørensen, A. V., Baandrup, L., Ibsen, M., Ibsen, R., & Kjellberg, J. (2025). Long-term effects of attention deficit hyperactivity disorder (ADHD) on social functioning and health care outcomes. Journal of Psychiatric Research, 182(February), 212-220. https://doi.org/10.1016/j.jpsychires.2025.01.016

Thygesen, L. C., Klitgaard, M. B., Sabers, A., Kjellberg, J., Søndergaard, J., Sørensen, J., Sonne, M., Juel, K., & Michelsen, S. I. (2024). Potentially avoidable mortality among adults with intellectual disability. European Journal of Public Health, 34(6), 1225-1231. https://doi.org/10.1093/eurpub/ckae118

Larsen, A. T., Sopina, L., Kvanner Aasvang, E., Sylvest Meyhoff, C., Rud Kristensen, S., & Kjellberg, J. (2024). Estimation of the maximum potential cost saving from reducing serious adverse events in hospitalized patients. Acta Anaesthesiologica Scandinavica, 68(10), 1471-1480. https://doi.org/10.1111/aas.14525

Nabi, H., Ibsen, R., Ibsen, M., Kjellberg, J., Hetland, M. L., & Glintborg, B. (2024). Counting the costs: a nationwide study on healthcare use following an adalimumab biosimilar switch in >1300 inflammatory arthritis patients. Therapeutic advances in musculoskeletal disease, 16. https://doi.org/10.1177/1759720X241289391

Jennum, P., Kjellberg, J., Carls, G., Ibsen, R., & Mettam, S. (2024). Real-world impact of continuous positive airway pressure on sleepiness in patients with obstructive sleep apnea in a national registry. Sleep Medicine, 118, 93-100. https://doi.org/10.1016/j.sleep.2024.03.011

Andersen, F., Kjellberg, J., Ibsen, R., Sternhufvud, C., & Petersen, B. (2024). The clinical and economic burden of illness in the first two years after ostomy creation: a nationwide Danish cohort study. Expert Review of Pharmacoeconomics & Outcomes Research, 24(4), 567-575. https://doi.org/10.1080/14737167.2024.2324047

Grønnemose, R. B., Hansen, P. S., Laursen, S. W., Gerke, O., Kjellberg, J., Lykkegaard, J., Thye-Rønn, C., Høilund-Carlsen, P. F., & Thye-Rønn, P. (2024). Risk of cancer and serious disease in Danish patients with urgent referral for serious non-specific symptoms and signs of cancer in Funen 2014-2021. British Journal of Cancer, 130(8), 1304-1315. https://doi.org/10.1038/s41416-024-02620-y

Amris, K., Ibsen, R., Duhn, P. H., Olsen, J., & Kjellberg, J. (2024). Health inequities and societal costs for patients with fibromyalgia and their spouses: a Danish cohort study. RMD Open, 10(1), Article e003904. https://doi.org/10.1136/rmdopen-2023-003904

Hastrup, L. H., Jennum, P., Ibsen, R., Kjellberg, J., & Simonsen, E. (2024). Borderline personality disorder and the diagnostic co-occurrence of mental health disorders and somatic diseases: A controlled prospective national register-based study. Acta Psychiatrica Scandinavica, 149(2), 124-132. https://doi.org/10.1111/acps.13642

Frausing, M. H. J. P., Nielsen, J. C., Westergaard, C. L., Gerdes, C., Kjellberg, J., Borani, G., & Kronborg, M. B. (2024). Economic analyses in cardiac electrophysiology: From clinical efficacy to cost utility. EP Europace, 26(2), Article euae031. https://doi.org/10.1093/europace/euae031

Sørensen, A. V., Kjellberg, J., Ibsen, R., Bastholt, L., Schmidt, H., & Svane, I. M. (2023). Health care and socioeconomic costs for long-term survivors after implementation of checkpoint-inhibitors and targeted agents for metastatic melanoma. European Journal of Cancer, 192, Article 113288. https://doi.org/10.1016/j.ejca.2023.113288

Nordentoft, M., Rasmussen, M., Høgh, L., Legind, C., & Kjellberg, J. (2023). How come Denmark is planning to increase the annual budget for psychiatry by almost 20 percent? European Psychiatry, 66(1), Article e68. https://doi.org/10.1192/j.eurpsy.2023.2409

Pickering, L., Main, K., Feldt‐Rasmussen, U., Sehested, A., Mathiasen, R., Klose, M., Ibsen, R., Kjellberg, J., & Jennum, P. J. (2023). Survival and long‐term socioeconomic consequences of childhood and adolescent onset of brain tumours. Developmental Medicine and Child Neurology, 65(7), 942-952. https://doi.org/10.1111/dmcn.15467

Buchter, M. L., Kjellberg, J., Ibsen, R., Sternhufvud, C., & Petersen, B. (2023). Burden of illness among intermittent catheter users with non-neurogenic urinary retention in Denmark. Expert Review of Pharmacoeconomics & Outcomes Research, 23(4), 409-418. https://doi.org/10.1080/14737167.2023.2181793

Houlind, K. C., & Kjellberg, J. (2023). Variation in lower limb amputation rates: a national scandal. British Journal of Surgery, 110(3), 291-293. https://doi.org/10.1093/bjs/znac417

von Heymann, A., Finsted, E., Guldin, MB., Andersen, EAW., Dammeyer, J., Sjogren, P., von der Maase, H., Benthien, KS., Kjellberg, J., Johansen, C., & Bidstrup, P. (2023). Effects of home-based specialized palliative care and dyadic psychological intervention on caregiver burden: results from a randomized controlled trial. Acta Oncologica, 62(7), 803-807. https://doi.org/10.1080/0284186X.2023.2194491

Christensen, J., Dreier, J. W., Sun, Y., Linehan, C., Tomson, T., Marson, A., Forsgren, L., Granbichler, C. A., Trinka, E., Illiescu, C., Malmgren, K., Kjellberg, J., Ibsen, R., & Jennum, P. J. (2023). Estimates of epilepsy prevalence, psychiatric co-morbidity and cost. Seizure - European Journal of Epilepsy, 107(April), 162-171. https://doi.org/10.1016/j.seizure.2022.06.010

Iversen, A. K., Wadmann, S., Bek, T., & Kjellberg, J. (2022). National clinical guidelines and treatment centralization do not guarantee consistency in healthcare delivery: A mixed-methods study of wet age-related macular degeneration treatment in Denmark. Health Policy, 126(12), 1291-1302. https://doi.org/10.1016/j.healthpol.2022.10.009, https://doi.org/10.1016/j.healthpol.2022.10.009

Kessel, L., Kjellberg, J., Ibsen, R., Rasmussen, A., Nissen, K., & la Cour, M. (2022). Longitudinal analysis of health care costs in patients with childhood onset inherited retinal dystrophies compared to healthy controls. BMC ophthalmology, 22, Article 466. https://doi.org/10.1186/s12886-022-02708-0

Kollerup, A., Kjellberg, J., & Ibsen, R. (2022). Ageing and health care expenditures: the importance of age per se, steepening of the individual‑level expenditure curve, and the role of morbidity. The European Journal of Health Economics, 23, 1121-1149. https://doi.org/10.1007/s10198-021-01413-x

Kessel, L., Kjellberg, J., Nissen, K., Rasmussen, A., & la Cour, M. (2022). Childhood-onset retinal dystrophies reduces life-time income by one third-an individual based socio-economic analysis. Ophthalmic Genetics, 43(5), 602-608. https://doi.org/10.1080/13816810.2022.2089359

Bundgaard, J. S., Mogensen, U. M., Christensen, S., Ploug, U., Ibsen, R., Kjellberg, J., & Køber, L. (2022). Direct and indirect costs of heart failure in relation to diabetes status-A nationwide study. Nutrition, Metabolism and Cardiovascular Diseases, 32(8), 1880-1885. https://doi.org/10.1016/j.numecd.2022.05.003

Bundgaard, J. S., Mogensen, U. M., Christensen, S., Ploug, U., Rørth, R., Ibsen, R., Kjellberg, J., & Køber, L. (2022). Healthcare cost variation in patients with heart failure: a nationwide study. Public Health , 207(June), 88-93. https://doi.org/10.1016/j.puhe.2022.03.019

Zhao, M., Jensen, M. S., Knudsen, T., Kelsen, J., Coskun, M., Kjellberg, J., & Burisch, J. (2022). Trends in the use of biologicals and their treatment outcomes among patients with inflammatory bowel diseases: a Danish nationwide cohort study. Alimentary Pharmacology and Therapeutics, 55(5), 541-557. https://doi.org/10.1111/apt.16723

Halling, C. M. B., Møller, M. H., Marker, S., Krag, M., Kjellberg, J., Perner, A., & Gyrd-Hansen, D. (2022). The effects of pantoprazole vs. placebo on 1-year outcomes, resource use and employment status in ICU patients at risk for gastrointestinal bleeding: a secondary analysis of the SUP-ICU trial. Intensive care medicine, 48(4), 426-434. https://doi.org/10.1007/s00134-022-06631-2

Solumsmoen, S., Poulsen, G., Kjellberg, J., Melbye, M., & Munch, T. N. (2021). The impact of specialised treatment of low back pain on health care costs and productivity in a nationwide cohort. EClinicalMedicine, 43, Article 10147. https://doi.org/10.1016/j.eclinm.2021.101247

Grønne, D. T., Roos, E. M., Ibsen, R., Kjellberg, J., & Skou, S. T. (2021). Cost-effectiveness of an 8-week supervised education and exercise therapy programme for knee and hip osteoarthritis: a pre-post analysis of 16 255 patients participating in Good Life with osteoArthritis in Denmark (GLA:D). BMJ Open, 11, Article e049541. https://doi.org/10.1136/bmjopen-2021-049541

Linehan, C., Benson, A., Gunko, A., Christensen, J., Sun, Y., Tomson, T., Marso, A., Forsgren, L., Trinka, E., Iliescu, C., Althoehn, J., Dreier, J. W., Sandu, C., Jennum, P., Kjellberg, J., Holmgaard, M. N., & Granbichler, C. (2021). Exploring the prevalence and profile of epilepsy across Europe using a standard retrospective chart review: Challenges and opportunities. Epilepsia, 62(11), 2651-2666. https://doi.org/10.1111/epi.17057

Rozing, M. P., Jønsson, A., Køster-Rasmussen, R., Due, T. D., Brodersen, J., Bissenbakker, K. H., Siersma, V., Mercer, S. W., Guassora, A. D., Kjellberg, J., Kjellberg, P. K., Nielsen, M. H., Christensen, I., Bardram, J. E., Martiny, F., Møller, A., & Reventlow, S. (2021). The SOFIA pilot trial: a cluster-randomized trial of coordinated, co-produced care to reduce mortality and improve quality of life in people with severe mental illness in the general practice setting. Pilot and Feasibility Studies, 7(168). https://doi.org/10.1186/s40814-021-00906-z

Bruhn, S. M., Ingelsrud, L. H., Bandholm, T. Q., Skou, S. T., Schrøder, H., Reventlow, S., Møller, A., Kjellberg, J., Kallemose, T., & Troelsen, A. (2021). Disentangling treatment pathways for knee osteoarthritis: a study protocol for the TREATright study including a prospective cohort study, a qualitative study and a cost-effectiveness study. BMJ Open, Article 048411.

Hannig, L. H., Nielsen, L. K., Ibsen, R., Arnheim‐Dahlström, L., Kjellberg, J., & Abildgaard, N. (2021). The impact of changed treatment patterns in multiple myeloma on health-care utilisation and costs, myeloma complications, and survival: A population-based comparison between two time periods in Denmark. European Journal of Haematology, 107/1, 63-73. https://doi.org/10.1111/ejh.13615

Kjellberg, J., & Tikkanen, C. (2021). Attributable societal costs of first-incident obesity-related cardiovascular comorbidities in Denmark. Expert Review of Pharmacoeconomics & Outcomes Research, 21(4), 673-681. https://doi.org/10.1080/14737167.2021.1908130

Asah, C., Frandsen, R., Ibsen, R., Kjellberg, J., & Jennum, P. (2021). Morbidity, Mortality, and Conversion to Neurodegenerative Diseases in Patients with REM Sleep Behavior Disorder and REM Sleep without Atonia. Neuroepidemiology, 141-153. https://doi.org/10.1159/000514175

Asah, C., Frandsen, R., Ibsen, R., Kjellberg, J., & Jennum, P. (2021). Morbidity, Mortality, and Conversion to Neurodegenerative Diseases in Patients with REM Sleep Behavior Disorder and REM Sleep without Atonia. Neuroepidemiology, 141-153. https://doi.org/10.1159/000514175

Frandsen, R., Asah, C., Ibsen, R., Kjellberg, J., & Jennum, P. (2021). Health, social, and economic consequences of rapid eye movement sleep behavior disorder: a controlled national study evaluating societal effects. Sleep, 44(2), Article zsaa162. https://doi.org/10.1093/sleep/zsaa162

Puggaard, R. S., Ingelsrud, L. H., Jacobsen, S., Kjellberg, J., Jacobsen, S., Bandholm, T., Hölmich, P., Boesen, M., Bliddal, H., Skou, S. T., Schrøder, H. M., Larsen, S. W., Møller, A., Ziegler, C., & Troelsen, A. (2021). Establishing research priorities related to osteoarthritis care via stakeholder input from patients. Danish Medical Journal, 68(2), Article A09200683.

Rasmussen, S. R., Søgaard, J., & Kjellberg, J. (2021). Lifetime costs and lifetime net public expenditures of smoking. European journal of public health, 31(3), 641-646. https://doi.org/10.1093/eurpub/ckaa209

Jennum, P., Debes, N. M. M. M., Ibsen, R., & Kjellberg, J. (2021). Long-term employment, education, and healthcare costs of childhood and adolescent onset of epilepsy. Epilepsy & Behavior, 114(Part A), Article 107256. https://doi.org/10.1016/j.yebeh.2020.107256

Hastrup, L. H., Jennum, P., Ibsen, R., Kjellberg, J., & Simonsen, E. (2020). Welfare consequences of early-onset Borderline Personality Disorder: a nationwide register-based case-control study. European Child & Adolescent Psychiatry, E-pub. https://doi.org/10.1007/s00787-020-01683-5

Kjellberg, J., Tikkanen, C. K., Bagger, M., & Gæde, P. (2020). Short-term societal economic burden of first-incident type 2 diabetes-related complications–a nationwide cohort study. Expert Review of Pharmacoeconomics & Outcomes Research, 20(6), 577-586. https://doi.org/10.1080/14737167.2020.1837626

Blinkenberg, M., Kjellberg, J., Ibsen, R., & Magyari, M. (2020). Increased socioeconomic burden in patients with primary progressive multiple sclerosis: A Danish nationwide population-based study. Multiple Sclerosis and Related Disorders, 46, Article 102567. https://doi.org/10.1016/j.msard.2020.102567

Jennum, P., Rejkjær-Knudsen, M., Ibsen, R., Kiær, E. K., Buchwald, C. V., & Kjellberg, J. (2020). Long-term health and socioeconomic outcome of obstructive sleep apnea in children and adolescents. Sleep Medicine, 75, 441-447. https://doi.org/10.1016/j.sleep.2020.08.017

Zhao, M., Jensen, M. S., Knudsen, T., Kelsen, J., Coskun, M., Kjellberg, J., & Burisch, J. (2020). Pattern of biological use and treatment outcome in patients with inflammatory bowel diseases-a danish nationwide study. United European Gastroenterology Journal, 8(8 Suppl.), 82. Article OP118. https://doi.org/10.1177/2050640620927344

Thomsen, S. F., Skov, L., Kristensen, L. E., Storling Hedegaard, M., Kjellberg, J., Jørgensen, T. S., Brenøe, S., & Dodge, R. (2020). Incentives for Danish healthcare management based on a pilot outcome-based, patient-centric management model in psoriasis and psoriatic arthritis: the non-interventional IMPROVE study. Archives of Public Health, 78, Article 95. https://doi.org/10.1186/s13690-020-00479-y

Halling, C. M. B., Wolf, R. T., Sjøgren, P., Von Der Maase, H., Timm, H., Johansen, C., & Kjellberg, J. (2020). Cost-effectiveness analysis of systematic fast-track transition from oncological treatment to specialised palliative care at home for patients and their caregivers: the DOMUS trial. BMC Palliative Care, 19, Article 142. https://doi.org/10.1186/s12904-020-00645-7

Jennum, P., Hastrup, L. H., Ibsen, R., Kjellberg, J., & Simonsen, E. (2020). Welfare consequences for people diagnosed with attention deficit hyperactivity disorder (ADHD): A matched nationwide study in Denmark. European Neuropsychopharmacology, 37, 29-38. https://doi.org/10.1016/j.euroneuro.2020.04.010

Benthien, K., Diasso, P., Von Heymann, A., Nordly, M., Kurita, G., Timm, H., Johansen, C., Kjellberg, J., von der Maase, H., & Sjøgren, P. (2020). Oncology to specialised palliative home care systematic transition: the Domus randomised trial. BMJ Supportive and Palliative Care , 10(3), 350-357. https://doi.org/10.1136/bmjspcare-2020-002325

Jennum, P., Ibsen, R., & Kjellberg, J. (2020). Long-term health and socioeconomic consequences of childhood and adolescent-onset of narcolepsy. Sleep Medicine, 67, 23-27. https://doi.org/10.1016/j.sleep.2019.10.013

Braae, U. C., Møller, F. T., Ibsen, R., Ethelberg, S., Kjellberg, J., & Mølbak, K. (2020). The economic burden of Clostridioides difficile in Denmark: a retrospective cohort study. Frontiers in public health, 8, Article 562957. https://doi.org/10.3389/fpubh.2020.562957

Skou, S. T., Roos, E., Laursen, M., Arendt-Nielsen, L., Rasmussen, S., Simonsen, O., Ibsen, R., Larsen, A. T., & Kjellberg, J. (2020). Cost-effectiveness of total knee replacement in addition to non-surgical treatment: a 2-year outcome from a randomised trial in secondary care in Denmark. BMJ Open, 10(1), e033495. Article e033495. https://doi.org/10.1136/bmjopen-2019-033495

Hastrup, L. H., Simonsen, E., Ibsen, R., Kjellberg, J., & Jennum, P. (2020). Societal Costs of Schizophrenia in Denmark: A Nationwide Matched Controlled Study of Patients and Spouses Before and After Initial Diagnosis. Schizophrenia Bulletin, 46(1), 68-77. https://doi.org/10.1093/schbul/sbz041

Skou, S. T., Roos, E. M., Laursen, M., Arendt-Nielsen, L., Rasmussen, S., Simonsen, O., Ibsen, R., Larsen, A. T., & Kjellberg, J. (2020). Cost-effectiveness of 12 weeks of supervised treatment compared to written advice in patients with knee osteoarthritis: a secondary analysis of the 2-year outcome from a randomized trial. BMJ Open, 28(7), 907-916. https://doi.org/10.1016/j.joca.2020.03.009

Hastrup, L. H., Jennum, P., Ibsen, R., Kjellberg, J., & Simonsen, E. (2019). Societal costs of Borderline Personality Disorders: A matched‐controlled nationwide study of patients and spouses. Acta psychiatrica scandinavia, 140(5), 458-467. https://onlinelibrary.wiley.com/doi/epdf/10.1111/acps.13094

Glintborg, B., Ibsen, R., Bilbo, R. E. Q., Hetland, M. L., & Kjellberg, J. (2019). Does a mandatory non-medical switch from originator to biosimilar etanercept lead to increase in healthcare use and costs? A Danish register-based study of patients with inflammatory arthritis. RMD Open, 5(2), Article e001016. https://doi.org/10.1136/rmdopen-2019-00101

Thomsen, S. F., Skov, L., Dodge, R., Hedegaard, M. S., & Kjellberg, J. (2019). Socioeconomic Costs and Health Inequalities from Psoriasis: A Cohort Study. Dermatology, 235(5), 372-379. https://doi.org/10.1159/000499924

Bundgaard, J. S., Mogensen, U. M., Christensen, S., Ploug, U., Rørth, R., Ibsen, R., Kjellberg, J., & Køber, L. (2019). The economic burden of heart failure in Denmark from 1998 to 2016. European Journal of Heart Failure, 21(12), 1526-1531. https://doi.org/10.1002/ejhf.1577

Jennum, P., Ibsen, R., & Kjellberg, J. (2019). Welfare consequences for people diagnosed with nonepileptic seizures: A matched nationwide study in Denmark. Epilepsy & Behavior, 98(Part A), 59-65. https://doi.org/10.1016/j.yebeh.2019.06.024

Løppenthin, K., Esbensen, B. A., Østergaard, M., Ibsen, R., Kjellberg, J., & Jennum, P. (2019). Morbidity and mortality in patients with rheumatoid arthritis compared with an age- and sex-matched control population: A nationwide register study. Journal of Comorbidity, 9. https://doi.org/10.1177/2235042X19853484

Wadmann, S., & Kjellberg, J. (2019). New model for prioritised adoption and use of hospital medicine in Denmark since 2017: Challenges and perspectives. Health Policy, 123(7), 606-610. https://doi.org/10.1016/j.healthpol.2019.05.007

Wadmann, S., Christensen, I. E., Kjellberg, J., & Greve, C. (2019). Breaking up a partnership to build a competitive market in Denmark’s ambulance service: How can studies of contract reversals learn from the sociology of markets? Local Government Studies. https://www.tandfonline.com/doi/full/10.1080/03003930.2019.1615463

Skou, S. T., Roos, E. M., Laursen, M., Arendt-Nielsen, L., Rasmussen, S., Simonsen, O., Ibsen, R., Larsen, A. T., & Kjellberg, J. (2019). 2-year cost-effectiveness of total knee replacement: results from the first randomized trial on total knee replacement in addition to non-surgical treatment. Osteoarthritis and Cartilage, 27(suppl. 1), S297. https://doi.org/10.1016/j.joca.2019.02.689

Skov, L., Thomsen, S. F., Kristensen, L. E., Dodge, R., Hedegaard, M. S., & Kjellberg, J. (2019). IMPROVE: mortality in psoriasis and psoriatic arthritis. British Journal of Dermatology , 180(1), e15-e15. Article e15-e15. https://doi.org/10.1111/bjd.17369

Gæde, J., Oellgaard, J., Ibsen, R., Gæde, P., Nørtoft, E., Parving, H., Kjellberg, J., & Pedersen, O. (2019). A cost analysis of intensified vs conventional multifactorial therapy in individuals with type 2 diabetes: a post hoc analysis of the Steno-2 study. Diabetologia, 62(1), 147-155. https://doi.org/10.1007/s00125-018-4739-3

Jensen, T. B., Andersen, J. T., KIM, SC., Kjellberg, J., & Barthels, D. (2019). PBI46 IMPLEMENTATION OF ADALIMUMAB BIOSIMILARS IN DENMARK. Value in health, 22(Supplement 3), S425. https://doi.org/10.1016/j.jval.2019.09.150

Bundgaard, J., Mogensen, U. M., Christensen, S., Ploug, U., Rørth, R., Ibsen, R., Kjellberg, J., & Koeber, L. (2019). P3812 The economic burden of heart failure in Denmark from 1998 to 2016. European Heart Journal, 40(Supplement 1), Article ehz745.0654. https://doi.org/10.1093/eurheartj/ehz745.0654

Bundgaard, J., Mogensen, U. M., Christensen, S., Ploug, U., Rørth, R., Ibsen, R., Kjellberg, J., & Koeber, L. (2019). P3813 The economic cost heterogeneity of patients with heart failure - a retrospective nationwide study. European Heart Journal, 40(Supplement 1), Article ehz745.0655. https://doi.org/10.1093/eurheartj/ehz745.0655

Wadmann, S., & Kjellberg, J. (2019). New model for prioritized adoption of hospital medicine in Denmark since 2017: Challenges and perspectives. Health Policy, 123(7), 606-610.

von Heymann-Horan, A., Bidstrup, P., Guldin, M., Sjøgren, P., Andersen, E. A. W., Von Der Maase, H., Kjellberg, J., Timm, H., & Johansen, C. (2018). Effect of home-based specialised palliative care and dyadic psychological intervention on caregiver anxiety and depression: a randomised controlled trial. British Journal of Cancer. https://doi.org/10.1038/s41416-018-0193-8, https://doi.org/10.1038/s41416-018-0193-8

von Heymann-Horan, A., Bidstrup, P., Guldin, M., Sjøgren, P., Andersen, E. A. W., Von Der Maase, H., Kjellberg, J., Timm, H., & Johansen, C. (2018). Effect of home-based specialised palliative care and dyadic psychological intervention on caregiver anxiety and depression: a randomised controlled trial. British Journal of Cancer. https://doi.org/10.1038/s41416-018-0193-8, https://doi.org/10.1038/s41416-018-0193-8

Nordly, M., Skov Benthien, K., Vadstrup, E. S., Kurita, G. P., Von Heymann-horan, A. B., Von Der Maase, H., Johansen, C., Timm, H., Kjellberg, J., & Sjøgren, P. (2018). Systematic fast-track transition from oncological treatment to dyadic specialized palliative home care: DOMUS – a randomized clinical trial. Palliative Medicine, 026921631881126. https://doi.org/10.1177/0269216318811269

Buch, M. S., Kjellberg, J., & Holm-petersen, C. (2018). Implementing Integrated Care – Lessons from the Odense Integrated Care Trial. International Journal of Integrated Care, 18(4). https://doi.org/10.5334/ijic.4164

Von Heymann-horan, A., Bidstrup, P. E., Johansen, C., Rottmann, N., Andersen, E. A. W., Sjøgren, P., Von Der Maase, H., Timm, H., Kjellberg, J., & Guldin, M. (2018). Dyadic coping in specialized palliative care intervention for patients with advanced cancer and their caregivers: Effects and mediation in a randomized controlled trial. Psycho-Oncology. https://doi.org/10.1002/pon.4932

Jørgensen, T. S., Lykkegaard, J. J., Hansen, A., Schrøder, H. M., Stampe, B., Sweeney, A. T., Appel Esbensen, B., Bech, B., Christensen, K., Friis-mikkelsen, E., Røgind, H., Lundbak, T., Taylor, P. C., Petersson, I. F., Wæhrens, E. E., Kjellberg, J., Gudbergsen, H., & Kristensen, L. E. (2018). Protocol for evaluating and implementing a pragmatic value-based healthcare management model for patients with inflammatory arthritis: a Danish population-based regional cohort and qualitative implementation study. BMJ Open, 8(10), e023915. https://doi.org/10.1136/bmjopen-2018-023915

Skov Henriksen, L., Thomsen, S. F., Kristensen, L. E., Dodge, R., Hedegaard, M. S., & Kjellberg, J. (2018). Cause-specific mortality in patients with psoriasis and psoriatic arthritis. British Journal of Dermatology. https://doi.org/10.1111/bjd.16919

Pickering, L., Jennum, P., Ibsen, R., & Kjellberg, J. (2018). Long-term health and socioeconomic consequences of childhood and adolescent onset of meningococcal meningitis. European Journal of Pediatrics, 177(9), 1309-1315. https://doi.org/10.1007/s00431-018-3192-0

Bech, M., Kjellberg, J., & Højgaard, B. (2018). Styringsgennemgang - virker den statslige styring af det regionale sundhedsvæsen? Administrativ Debat, 12-24.

Gaede, J., Oellgaard, J., Ibsen, R., Gæde, P., Noertoft, E., Kjellberg, J., & Pedersen, O. (2018). A Cost Analysis of Intensified vs. Conventional Multifactorial Therapy of Patients with Type 2 Diabetes—The Steno 2 Study. Diabetes, 67(Supplement 1), 162-OR. https://doi.org/10.2337/db18-162-OR

Jensen, T. B., Jimenez-solem, E., Cortes, R., Betzer, C., Bøge Breinholt, S., Meidahl Petersen, K., Studsgaard Petersen, T., Kjellberg, J., Christensen, H. R., & Trærup Andersen, J. (2018). Content and validation of the Electronic Patient Medication module (EPM)—the administrative in-hospital drug use database in the Capital Region of Denmark. Scandinavian Journal of Public Health, 48, 43-48. https://doi.org/10.1177/1403494818760050

Nilsson, M., Rungby, J., Lassota, N., Jørgensen, A. D., Ibsen, R., & Kjellberg, J. (2018). No Impact of Pre-existing Cardiovascular Disease on Prescribing Patterns of Sulphonylureas in Denmark - A Registry-based Nationwide Study. Basic & Clinical Pharmacology & Toxicology, 122(6), 606-611. https://doi.org/10.1111/bcpt.2018.122.issue-6

Møller , A., Kjellberg, J., & Pedersen, T. (2018). Health economic analysis of smoking cessation prior to surgery - based on a randomized study. Ugeskrift for Læger.

Kjellberg, J., & Søgaard, J. (2018). Waiting lists: Why do they arise, and what can be done about them? . Ugeskrift for Læger.

Larsen, A. T., Højgaard, B., Ibsen, R., & Kjellberg, J. (2018). The Socio-economic Impact of Bariatric Surgery. OBES SURG, 28(2), 338-348. https://doi.org/10.1007/s11695-017-2834-z

Jennum, P., Baandrup, L., Tønnesen, P., Ibsen, R., & Kjellberg, J. (2017). Mortality and use of psychotropic medication in sleep apnoea patients: a population-wide register-based study. Sleep Medicine, 5(11), 1142-1148.

Kjellberg, J., Wolf, R. T., Kruse, M., Rasmussen, S. R., Vestergaard, J., Nielsen, K. J., & Rasmussen, K. (2017). Costs associated with adverse events among acute patients. BMC Health Services Research, 17(1), 651-655. https://doi.org/10.1186/s12913-017-2605-5

Kjellberg, J., Larsen, A. T., Ibsen, R., & Højgaard, B. (2017). The Socioeconomic Burden of Obesity. Obesity Facts, 10(5), 493-502. https://doi.org/10.1159/000480404

Benthien, K. S., Nordly, M., Heymann-Horann, A. V., Holmenlund, K., Timm, H., Kurita, G., Johansen, C., Kjellberg, J., Maase, H. V. D., & Sjøgren, P. (2017). Causes of hospital admissions in Domus: a randomized controlled trial of specialized palliative cancer care at home. Journal of Pain and Symptom Management, 2017(10).

Bolin, K., Berling, P., Wasling, P., Meinild, H., Kjellberg, J., & Jennum, P. (2017). The cost-utility of sodium oxybate as narcolepsy treatment. Acta Neurologica Scandinavica, 07.

Jennum, P., Thorstensen, E. W., Pickering, L., Ibsen, R., & Kjellberg, J. (2017). Morbidity and mortality of middle-aged and elderly narcoleptics. Sleep Medicine, 2017(36), 23-28.

Jennum, P., Tønnesen, P., Ibsen, R., & Kjellberg, J. (2017). Obstructive sleep apnea: effect of comorbidities and positive airway pressure on all-cause mortality. Sleep Medicine, 2017(36), 62-66.

Jennum, P., Sabers, A., Christensen, J., Ibsen, R., & Kjellberg, J. (2017). Welfare consequences for people with epilepsy and their partners: A matched nationwide study in Denmark. Seizure, 5(49), 17-24. https://doi.org/10.1016/j.seizure.2017.05.007

Søndergaard, J., Christensen, H. N., Ibsen, R., Jarbøl, D. E., & Kjellberg, J. (2017). Healthcare resource use and costs of opioid-induced constipation among non-cancer and cancer patients on opioid therapy: A nationwide register-based cohort study in Denmark. Scandinavian Journal of Pain, 04(15), 83-90.

Achiam, M. P., Kjellberg, J., & Rosenberg, J. (2017). Health economic aspects of evaluation with diffusion weighted MR and MR colonography compared to standard evaluation with colonoscopy and CT before rectal cancer surgery. Acta Radiologica, 58(4). https://doi.org/10.1177/0284185116653281

Heymann-Horan, A. B. V., Puggaard, L. B., Kathrine G Nissen, C. J., Benthien, K. S., Bidstrup, P., Coyne, J., Nordly, M., Kjellberg, J., Sjøgren, P., Timm, H., Maase, H. V. D., & Guldin, M.-B. (2017). Dyadic psychological intervention for patients with cancer and caregivers in home-based specialized palliative care. Palliative and Supportive Care, 03(17).

Kjellberg, J., Hansen, T. B., Zwisler, A. D., Berg, S. K., Sibilitz, K. L., Thygesen, L. C., Doherty, P., Oldridge, N., & Søgaard, R. (2017). Cost-utility analysis of cardiac rehabilitation after conventional heart valve surgery versus usual care. European Journal of Preventive Cardiology, 24(7), 698-707. https://doi.org/10.1177/2047487317689908

Kristensen, L. E., Jørgensen, T. S., Christensen, R., Gudbergsen, H., Dreyer, L., Ballegaard, C., Jacobsson, L. T. H., Strand, V., Mease, P. J., & Kjellberg, J. (2017). Societal costs and patients' experience of health inequities before and after diagnosis of psoriatic arthritis: a Danish cohort study. Annals of the Rheumatic Diseases, 01/2017. https://doi.org/10.1136/annrheumdis-2016-210579

Kjellberg, J., Jennum, P., Pickering, L., Christensen, J., & Ibsen, R. (2016). Morbidity and mortality of childhood- and adolescent-onset epilepsy: A controlled national study. Epilepsy & Behavior, 12(66).

Jennum, P., Pickering, L., Thorstensen, E. W., Ibsen, R., & Kjellberg, J. (2016). Morbidity of childhood onset narcolepsy: a controlled national study. Sleep Medicine, 26(October).

Kjellberg, J., Kay, L., Nielsen, N. M., Wanscher, B., Ibsen, R., & Jennum, P. (2016). Morbidity and mortality following poliomyelitis - a lifelong follow-up. European Journal of Neurology, 11. https://doi.org/10.1111/ene.13201

Løppenthin, K., Esbensen, B. A., Østergaard, M., Ibsen, R., Kjellberg, J., & Jennum, P. (2016). Welfare costs in patients with rheumatoid arthritis and their partners compared with matched controls: a register-based study. Clinical Rheumatology.

Jennum, P., Sabers, A., Christensen, J., Ibsen, R., & Kjellberg, J. (2016). Socioeconomic outcome of epilepsy surgery: A controlled national study. Seizure - European Journal of Epilepsy, 42(November), 52-56.

Jennum, P., Sabers, A., Christensen, J., Ibsen, R., & Kjellberg, J. (2016). Socioeconomic evaluation of vagus stimulation: A controlled national study. Seizure - European Journal of Epilepsy, 42(November), 15-19.

Kjellberg, J., & Kehlet, H. (2016). A nationwide analysis of socioeconomic outcomes after hip and knee replacement. Danish Medical Journal, 8(August).

Kjellberg, J., Jorgensen, A. D., Vestergaard, P., Ibsen, R., Gerstoft, F., & Modi, A. (2016). Cost and health care resource use associated with noncompliance with oral bisphosphonate therapy: an analysis using Danish health registries. Osteoporosis International.

Kjellberg, J., Jennum, P., Christensen, J., & Ibsen, R. (2016). Long-term socioeconomic consequences and health care costs of childhood and adolescent-onset epilepsy. Epilepsia, 57(7), p1078-1085.

Jennum, P., Pickering, L., Christensen, J., Ibsen, R., & Kjellberg, J. (2016). Welfare cost of childhood- and adolescent-onset epilepsy: A controlled national study. Epilepsy & Behavior, 61(August), p72-77.

[Unknown], F.-F., Ibsen, R., Kjellberg, J., & Jennum, P. (2016). Health, social and economic consequences of dementias: A comparative national cohort study. European Journal of Neurology, 23(9), p1400-1407.

Nielsen, N. M., Kay, L., Wanscher, B., Ibsen, R., Kjellberg, J., & Jennum, P. (2016). Long-term socio-economic consequences and health care costs of poliomyelitis: a historical cohort study involving 3606 polio patients. Journal of Neurology.

Jennum, P., Baandrup, L., Iversen, H., Ibsen, R., & Kjellberg, J. (2016). Mortality and use of psychotropic medication in patients with stroke: A population-wide, register-based study. BMJ Open, 6(3), 1-8.

Bendix, T., Kjellberg, J., Ibsen, R., & Jennum, P. J. (2016). Whiplash(-like) injury diagnoses and co-morbidities – both before and after the injury: A national registry-based study. BMC Musculoskeletal Disorders, 17(1), 1-9.

Jennum, P., baandrup, L., Ibsen, R., & Kjellberg, J. (2015). Increased all-cause mortality with use of psychotropic medication in dementia patients and controls: A population-based register study. European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology, 25(11), 1906-1913.

Jennum, P., Iversen, H., Ibsen, R., & Kjellberg, J. (2015). Cost of stroke: A controlled national study evaluating societal effects on patients and their partners. BMC Health Services Research, 15(1), 1-10.

Sørensen, A., Donskov, F., Kjellberg, J., Ibsen, R., Hermann, G., Jensen, N., Fode, K., & Geertsen, P. (2015). Health Economic Changes as a Result of Implementation of Targeted Therapy for Metastatic Renal Cell Carcinoma: National Results from DARENCA Study 2. European Urology, 68(3), 516-522.

Fløe, A., Hilberg, O., Wejse, C., Løkke, A., Kjellberg, J., Ibsen, R., & Jennum, P. (2015). Age-specific mortality among tuberculosis-patients in Denmark 1998-2010. European Respiratory Journal, 46(Suppl 59).

Steenholdt, C., Brynskov, J., Thomsen, O., Munck, L., Fallingborg, J., Christensen, L., Pedersen, G., Kjeldsen, J., Jacobsen, B., Oxholm, A. S., Kjellberg, J., Bendtzen, K., & Ainsworth, M. (2015). Sa1268 Individualized Therapy Is Long-Term Cost-Effective Compared to Dose Intensification in Crohn's Disease Patients Failing Infliximab. Digestive Diseases and Sciences, 148(4).

Jennum, P., Tønnesen, P., Ibsen, R., & Kjellberg, J. (2015). All-cause mortality from obstructive sleep apnea in male and female patients with and without continuous positive airway pressure treatment: A registry study with 10 years of follow-up. Nature and Science of Sleep, 2015(7), 43-50.

Fløe, A., Hilberg, O., Wejse, C., Løkke, A., Ibsen, R., Kjellberg, J., & Jennum, P. (2015). The economic burden of Tuberculosis in Denmark 1998-2010. Cost analysis in patients and their spouses. International journal of infectious diseases: IJID: official publication of the International Society for Infectious Diseases, 32, 183-190.

Frandsen, R., Baandrup, L., Kjellberg, J., Ibsen, R., & Jennum, P. (2014). Increased all-cause mortality with psychotropic medication in Parkinson’s disease and controls: A national register-based study. Parkinsonism & Related Disorders, 20(11), 1124-1128.

Kjellberg, J. (2014). Økonomiske betragtninger og cost-effectiveness ved screening. Ugeskrift for Læger, 12(2014), 1119-1122.

Frandsen, R., Kjellberg, J., Ibsen, R., & Jennum, P. (2014). Morbidity in early Parkinson's disease and prior to diagnosis. Brain and Behavior, 4(3), 446-452.

Jennum, P., Ibsen, R., Avlund, K., & Kjellberg, J. (2014). Health, social and economic consequences of hypersomnia: A controlled national study from a national registry evaluating the societal effect on patients and their partners. The European Journal of Health Economics , 15(3), 303-311.

Løkke, A., Hilberg, O., Tønnesen, P., Ibsen, R., Kjellberg, J., & Jennum, P. (2014). Direct and indirect economic and health consequences of COPD in Denmark: a national register-based study: 1998-2010. BMJ Open, 4(1), e004069.

Jennum, P., Ibsen, R., & Kjellberg, J. (2014). Social consequences of sleep disordered breathing on patients and their partners: A controlled national study. European Respiratory Journal, 43(1), 134-144.

Løkke, A., Hilberg, O., Kjellberg, J., Ibsen, R., & Jennum, P. (2013). Economic and Health Consequences of COPD Patients and Their Spouses in Denmark-1998-2010. COPD. Journal of Chronic Obstructive Pulmonary Disease. https://doi.org/10.3109/15412555.2013.839647

Jennum, P., Kjellberg, J., Ibsen, R., & Bendix, T. (2013). Health, Social and Economic Consequences of Polyneuropathy: A Controlled National Study Evaluating Societal Effects on Patients and Their Partners. European Neurology, 73(1-2), 81-88.

Bentzen, J., Kjellberg, J., Thorgaard, C., Engholm, G., Phillip, A., & Storm, H. H. (2013). Costs of illness for melanoma and nonmelanoma skin cancer in Denmark. European Journal of Cancer Prevention, 22(6), 569-576.

Jennum, P., Ibsen, R., & Kjellberg, J. (2013). Morbidity and mortality in children with obstructive sleep apnoea: A controlled national study. Thorax, 68(10), 949-954.

Steenholdt, C., Brynskov, J., Thomsen, O. Ø., Munck, L. K., Fallingborg, J., Christensen, L. A., Pedersen, G., Kjeldsen, J., Jacobsen, B. A., Oxholm, A. S., Kjellberg, J., Bendtzen, K., & Ainswort, M. A. (2013). Individualised therapy is more cost-effective than dose intensification in patients with Crohn's disease who lose response to anti-TNF treatment: a randomised, controlled trial. GUT. https://doi.org/10.1136/gutjnl-2013-305279

Jennum, P., Ibsen, R., Knudsen, S., & Kjellberg, J. (2013). Comorbidity and mortality of narcolepsy: a controlled retro- and prospective national study. Sleep Medicine, 36(6), 835-840.

Steenholdt, C., Brynskov, J., Thomsen, O., Munck, L. K., Fallingborg, J., Christensen, L. A., Pedersen, G., Kjeldsen, J., Jacobsen, B. A., Oxholm, A. S., Kjellberg, J., Bendtzen, K., & Ainsworth, M. A. (2013). Treatment of Secondary Infliximab Failure in Crohn's Disease Based on Serum Levels of Infliximab and Antibodies Against Infliximab: The Danish Study of Optimizing Infliximab Therapy in Crohn's Disease (Do It Crohn) Randomized Clinical Trial. Gastroenterology, 144(5).

Jennum, P., Ibsen, R., Pedersen, S. W., & Kjellberg, J. (2013). Mortality, health, social and economic consequences of amyotrophic lateral sclerosis: A controlled national study. Journal of Neurology, 260(3), 785-793. http://projekt.dsi.dk/uploads/upload_508fac044d131.pdf

Jennum, P., Ibsen, R., & Kjellberg, J. (2013). Morbidity prior to a Diagnosis of Sleep-Disordered Breathing: A Controlled National Study. Journal of clinical sleep medicine, 9(2), 103-108.

Jennum, P., Frederiksen, J., Wanscher, B., & Kjellberg, J. (2012). The socioeconomic consequences of optic neuritis with and without multiple sclerosis: a controlled national study. Acta Neurologica Scandinavica, (1). https://doi.org/10.1111/j.1600-0404.2012.01703.x

Jennum, P., Ibsen, R., Petersen, E. R., Knudsen, S., & Kjellberg, J. (2012). Health, social, and economic consequences of narcolepsy: a controlled national study evaluating the societal effect on patients and their partners. Sleep Medicine, (1). https://doi.org/10.1016/j.sleep.2012.06.006

Jennum, P., Wanscher, B., Frederiksen, J., & Kjellberg, J. (2012). The socioeconomic consequences of multiple sclerosis: A controlled national study. European Neuropsychopharmacology, 22(1), 36-43. http://www.sciencedirect.com/science/article/pii/S0924977X11001003

Jennum, P., Kjellberg, J., Ibsen, R., & Bendix, T. (2012). Health, social and economic consequences of neck injuries: A controlled national study evaluating societal effects on patients and their partners. Spine, 38(5), 449-457. http://www.ncbi.nlm.nih.gov/pubmed/23238487

Jennum, P., Zoetmulder, M., Korbo, L., & Kjellberg, J. (2011). The health-related, social and economic consequences of Parkisonism: a controlled national study. Journal of Neurology, 258(8), 1497–1506. https://doi.org/10.1007/s00415-011-5969-1

Kjellberg, J. (2011). Waiting lists shall be understood and organized correctly. Ugeskrift for Læger, 173(21).

Jennum, P., Gyllenborg, J., & Kjellberg, J. (2011). The social and economic consequences of epilepsy: A controlled national study. Epilepsia. http://onlinelibrary.wiley.com/doi/10.1111/j.1528-1167.2010.02946.x/abstract

Jennum, P., & Kjellberg, J. (2011). Health, social and economical consequences of sleep-disordered breathing: A controlled national study. Thorax. http://thorax.bmj.com/content/early/2011/01/02/thx.2010.143958.short?rss=1

Rytter, L., Jakobsen, H. N., Rønholt, F., Hammer, A. V., Andreasen, A. H., Nissen, A., & Kjellberg, J. (2010). Comprehensive discharge follow-up in patients' homes by GPs and district nurses of elderly patients: A randomized controlled trial. Scandinavian Journal of Primary Health Care, 28(3).

Jennum, P., & Kjellberg, J. (2010). The socio-economical burden of hypersomnia. Acta Neurologica Scandinavica, 121(4). http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0404.2009.01227.x/abstract

Buch, M. S., & Kjellberg, J. (2010). Kapacitet i fremtidens almenpraksis : Muligheder og udfordringer for at realisere de overordnede visioner. Månedsskrift for almen praksis, 89(5), 421-430.

Kruse, M., Hochstrasser, S., Zwisler, A. D., & Kjellberg, J. (2006). Comprehensive cardiac rehabilitation: a cost assessment based on a randomized clinical trial. International Journal of Technology Assessment in Health Care, 22(4), 478-483.

Kürstein, P., Gluud, L. L., Würgler, M. W., Olsen, K. R., Kjellberg, J., Søgaard, J., & Gluud, C. (2006). Agreement between reported use of interventions for liver diseases and research evidence in Cochrane systematic reviews. Journal of Hepatology, 43(6). http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W7C-4GM44KR-4&_user=641751&_coverDate=12%2F31%2F2005&_rdoc=16&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info(%23toc%236623%232005%23999569993%23611047%23FLA%23display%23

Møller, A. M., Kjellberg, J., & Pedersen, T. (2006). Sundhedsøkonomisk analyse af rygestop før operation : Baseret på et randomiseret studie. Ugeskrift for Læger, 168(10).

Søndergaard, B., Kirkeby, B., Dinesen, C., Herborg, H., Kjellberg, J., & Staehr, P. (2006). Drug-related problems in general practice: Results from a development project in Denmark. Pharmacy World and Science, 28(2), 61-64.

Kjellberg, J., & Søgaard, J. (2004). Ventelister - hvorfor opstår de, og hvad kan der gøres? Ugeskrift for Læger, 166(47), 4737-4740.