Volkert Dirk Siersma
!!Statistiker, External Lecturer
Forskningsenheden for Almen Praksis
Øster Farimagsgade 5
1353 København K
Section of Biostatistics
Øster Farimagsgade 5 opg. B
1353 København K
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Mobility decline in old age: the combined effect of mobility-related fatigue and socioeconomic position
Nilsson, Charlotte Juul, Siersma, Volkert Dirk, Mänty, M. R., Avlund, K., Vass, Mikkel & Lund, Rikke, 2014, In: Journal of Epidemiology & Community Health. 68, p. 510-515 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Mobility limitation as determinant of primary care use and ambulatory care sensitive conditions
Jørgensen, Terese Sara Høj, Siersma, Volkert Dirk, Lund, Rikke & Nilsson, Charlotte Juul, 2019, In: European Geriatric Medicine. 10, 1, p. 53-60 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Moderate-to-high intensity physical exercise in patients with Alzheimer’s disease: a randomised controlled trial.
Hoffmann, K., Sobol, N. A., Frederiksen, K. S., Beyer, N. A-M., Vogel, A. M., Vestergaard, K., Brændgaard, H., Gottrup, H., Lolk, A., Wermuth, L., Jacobsen, S., Laugesen, L. P., Gergelyffy, R. G., Høgh, P., Bjerregaard, E., Andersen, B. B., Siersma, V. D., Johannsen, P., Cotman, C. W., Waldemar, G. & 1 others, , 2016, In: Journal of Alzheimer's Disease. 50, 2, p. 443-453 11 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Monocytosis in primary care and risk of haematological malignancies
Christensen, M. E., Siersma, Volkert Dirk, Kriegbaum, Margit, Lind, B. S., Samuelsson, J., Østgård, L. S. G., Grønbæk, Kirsten & Andersen, Christen Bertel L, 2023, In: European Journal of Haematology. 110, 4, p. 362-370 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Monte Carlo Evaluation of Model Search in Graphical Models for Ordinal Data
Siersma, Volkert Dirk & Kreiner, Svend, 2008, Heidelberg: Physica-Verlag.Research output: Book/Report › Report › Research
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Monte Carlo and bootstrap evaluation of model search in graphical models for ordinal data
Siersma, Volkert Dirk & Kreiner, Svend, 2010.Research output: Contribution to conference › Conference abstract for conference › Research
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Mortality Following Trajectories of Mobility Limitations: The Modifying Impact of Social Factors
Jørgensen, Terese Sara Høj, Siersma, Volkert Dirk, Lund, Rikke & Nilsson, Charlotte Juul, 2020, In: Journal of Aging and Health. 32, 3-4, p. 134-142 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Motivation, effort and life circumstances as predictors of foot ulcers and amputations in people with Type 2 diabetes mellitus
Bruun, C., Guassora, Ann Dorrit, Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Holstein, P. E. & Olivarius, Niels de Fine, 14 Jul 2014, In: Diabetic Medicine. 31, 11, p. 1468-76 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Multimorbidity and mortality: A 15-year longitudinal registry-based nationwide Danish population study
Willadsen, Tora Grauers, Siersma, Volkert Dirk, Nicolaisdottir, Dagny Ros, Køster-Rasmussen, Rasmus, Jarbøl, D. E., Reventlow, Susanne, Mercer, S. & Olivarius, Niels de Fine, 2018, In: Journal of Comorbidity. 8, p. 1-9 9 p., 8.Research output: Contribution to journal › Journal article › Research › peer-review
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Multimorbidity in patients with low back pain in Danish chiropractic practice: a cohort study
Rafn, B. S., Hartvigsen, J., Siersma, Volkert Dirk & Andersen, John Sahl, 2023, In: Chiropractic and Manual Therapies. 31, 1, 11 p., 8.Research output: Contribution to journal › Journal article › Research › peer-review
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Multivariable modelling for meta-epidemiological assessment of the association between trial quality and treatment effects estimated in randomized clinical trials
Siersma, Volkert Dirk, Als-Nielsen, B., Chen, W., Hilden, Jørgen, Gluud, L. L. & Gluud, C. N., 2007, In: Statistics in Medicine. 26, 14, p. 2745-2758 13 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Neurosurgical Admission Later Than 4 h After the Emergency Call Does Not Result in Worse Long-Term Outcome in Subarachnoid Haemorrhage
Sonne, A., Andersen, J. B., Eskesen, V., Lippert, F., Waldorff, Frans Boch, Siersma, Volkert Dirk, Lohse, Nicolai Rasch & Rasmussen, L. S., 2021, In: Frontiers in Neurology. 12Research output: Contribution to journal › Journal article › Research › peer-review
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No effect of anti-TNF-α agents on the surgical stress response in patients with inflammatory bowel disease undergoing bowel resections: a prospective multi-center pilot study
El-Hussuna, A., Qvist, N., Zangenberg, M. S., Langkilde, A., Siersma, Volkert Dirk, Hjort, S. & Gögenur, I., 2018, In: BMC Surgery. 18, 10 p., 91.Research output: Contribution to journal › Journal article › Research › peer-review
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No increased risk of developing depression in diabetes compared to other chronic illness
Kessing, L. V., Nilsson, F. M., Siersma, Volkert Dirk & Andersen, Per Kragh, 2003, In: Diabetes Research and Clinical Practice. 62, p. 113-121Research output: Contribution to journal › Journal article › Research › peer-review
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Non-specific symptoms and signs of cancer: different organisations of a cancer patient pathway in Denmark
Damhus, Christina Sadolin, Siersma, Volkert Dirk, Dalton, Susanne Oksbjerg & Brodersen, John Brandt, 2021, In: Scandinavian Journal of Primary Health Care. 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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OP0006-HPR Even in The Long Run Nordic Walking Is Superior To Strength Training and Home Based Exercise for Improving Physical Function in Older People with Hip Osteoarthritis - An RCT
Bieler, T., Siersma, Volkert Dirk, Magnusson, Stig Peter, Kjær, M. & Beyer, N., 2016, In: Annals of the Rheumatic Diseases. 75, p. 55 1 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Occupational physical activity predicts baseline and 8-year progression of carotid atherosclerosis among women
Korshøj, M., Allesøe, K., Mortensen, Ole Steen, Siersma, Volkert Dirk, Kauhanen, J. & Krause, N., 2023, In: Scandinavian Journal of Medicine and Science in Sports. 33, 9, p. 1792-1806 15 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Ocular graft-versus-host disease and dry eye disease after paediatric haematopoietic stem cell transplantation - incidence and risk factors
Jeppesen, H., Kielsen, K., Siersma, Volkert Dirk, Lindegaard, J., Julian, H. O., Heegaard, Steffen, Sengeløv, Henrik & Muller, Klaus, 2022, In: Bone Marrow Transplantation. 57, p. 487–498 12 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Omkostningsanalyse af sundhedsudgifter ved Danish Lung Cancer Screening Trial, DLCST - en registerundersøgelse
Rasmussen, J. F., Brodersen, John Brandt, Siersma, Volkert Dirk, Saghir, Z., Dirksen, A. & Pedersen, J. H., 2012, København: Ministeriet for Sundhed og Forebyggelse.Research output: Book/Report › Report › Research
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Ophthalmic symptoms, clinical signs and diagnostic delay in infants diagnosed with brain tumours in Denmark between 2007 and 2017
Turanzas, N. J., Mathiasen, René, Heegaard, Steffen, Schmiegelow, Kjeld, Sehested, A., Holtz, J. K., Siersma, Volkert Dirk, Nissen, K. R. & von Holstein, Sarah Linea, 2024, In: Acta Ophthalmologica. 102, 3, p. 334-341 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Optimal volume of local anaesthetic for the adductor canal block: Using the continual reassessment method to estimate the ED95
Jæger, P., Jenstrup, M. T., Lund, J., Siersma, Volkert Dirk, Brøndum, V., Hilsted, K. L. & Dahl, J. B., 2015, In: British Journal of Anaesthesia. 115, 6, p. 920-926 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Overdiagnosis of lung cancer with low-dose computed tomography screening: meta-analysis of the randomised clinical trials
Brodersen, John Brandt, Voss, T., Martiny, Frederik Handberg Juul, Siersma, Volkert Dirk, Barratt, A. & Heleno, B., 2020, In: Breathe. 16, 1, 11 p., 200013.Research output: Contribution to journal › Review › Research › peer-review
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P05-13 Associations between occupational physical activity and progression of carotid atherosclerosis among middle-aged women, are those with pre-existing cardiovascular disease more vulnerable?
Korshoj, M., Allesoe, K., Mortensen, Ole Steen, Siersma, Volkert Dirk & Kauhanen, J., 2022, In: European Journal of Public Health. 32, 1 p.Research output: Contribution to journal › Conference abstract in journal › Research › peer-review
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PCB Concentrations and Dioxin-like Activity in Blood Samples from Danish School Children and Their Mothers living in Urban and Rural Areas
Mørck, T. A., Erdmann, S. E., Long, M., Mathiesen, Line, Nielsen, F., Siersma, Volkert Dirk, Bonefeld-Jørgensen, E. C. & Knudsen, Lisbeth E., Jul 2014, In: Basic & Clinical Pharmacology & Toxicology. 115, 1, p. 134-44 11 p.Research output: Contribution to journal › Journal article › Research › peer-review
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PFAS concentrations in plasma samples from Danish school children and their mothers
Mørck, T. A., Nielsen, F., Nielsen, J. K. S., Siersma, Volkert Dirk, Grandjean, P. & Knudsen, Lisbeth E., 2015, In: Chemosphere. 129, p. 203-209 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Paracetamol for feverish children: parental motives and experiences
Jensen, J. F., Tonnesen, L. L., Söderström, M., Thorsen, Hanne & Siersma, Volkert Dirk, 2010, In: Scandinavian Journal of Primary Health Care. 28, 2, p. 115-120 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Participation bias in a randomised trial of screening for lung cancer
Hestbech, Mie Sara, Siersma, Volkert Dirk, Dirksen, A., Pedersen, J. H. & Brodersen, John Brandt, 2011, In: Lung Cancer. 73, 3, p. 325-31 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Patients newly diagnosed with clinical type 2 diabetes during oral glucocorticoid treatment and observed for 14 years: all-cause mortality and clinical developments
Olivarius, Niels de Fine, Siersma, Volkert Dirk, Dyring-Andersen, B., Drivsholm, Thomas, Hansen, Lars J & Henriksen, J. E., Apr 2011, In: Basic & Clinical Pharmacology & Toxicology. 108, 4, p. 285-288 4 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Patients newly diagnosed with clinical type 2 diabetes mellitus but presenting with HbA1c within normal range: 19-year mortality and clinical outcomes
Veloso, A. G., Siersma, Volkert Dirk, Heldgaard, P. E. & Olivarius, Niels de Fine, 2013, In: Primary Care Diabetes. 7, 1, p. 33-38Research output: Contribution to journal › Journal article › Research › peer-review
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Patients with Alzheimer's disease who carry the APOE ε4 allele benefit more from physical exercise
Jensen, C. S., Simonsen, A. H., Siersma, Volkert Dirk, Beyer, N., Frederiksen, K. S., Gottrup, H., Hoffman, K., Høgh, Peter, Frikke-Schmidt, Ruth, Sobol, N. A., Waldemar, Gunhild, Wermuth, L. & Hasselbalch, Steen, 2019, In: Alzheimer's and Dementia: Translational Research and Clinical Interventions. 5, 1, p. 99-106 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Perioperative hyperoxia - Long-term impact on cardiovascular complications after abdominal surgery, a post hoc analysis of the PROXI trial
Fonnes, S., Gogenur, I., Sondergaard, E. S., Siersma, Volkert Dirk, Jørgensen, Lars Nannestad, Wetterslev, J. & Meyhoff, Christian Sylvest, 15 Jul 2016, In: International Journal of Cardiology. 215, p. 238-243Research output: Contribution to journal › Journal article › Research › peer-review
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Peripheral vascular disease is associated with reduced glycosuria in newly diagnosed type 2 diabetic patients.
Olivarius, Niels de Fine, von Holstein-Rathlou, Niels-Henrik, Siersma, Volkert Dirk, Witt, K., Vestbo, E., Andreasen, A. H. & Mogensen, C. E., 2004, In: Diabetes & Metabolism. 30, 3, p. 269-74 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Physical activity paradox: could inflammation be a key factor?
Feinberg, J. B., Møller, Anne, Siersma, Volkert Dirk, Bruunsgaard, Helle & Mortensen, Ole Steen, 2022, In: British Journal of Sports Medicine. 56, 21, p. 1224-1229Research output: Contribution to journal › Journal article › Research › peer-review
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Physical discomfort in early pregnancy and postpartum depressive symptoms
Ertmann, Ruth Kirk, Nicolaisdottir, Dagny Ros, Kragstrup, Jakob, Siersma, Volkert Dirk, Lutterodt, Melissa C. & Bech, P., 2019, In: Nordic Journal of Psychiatry. 73, 3, p. 200-206 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Point of care susceptibility testing in primary care: does it lead to a more appropriate prescription of antibiotics in patients with uncomplicated urinary tract infections? Protocol for a randomized controlled trial
Holm, Anne, Cordoba Currea, Gloria Cristina, Sørensen, Tina Møller, Jessen, Lisbeth Rem, Siersma, Volkert Dirk & Bjerrum, Lars, 2015, In: B M C Family Practice. 16, 8 p., 106.Research output: Contribution to journal › Journal article › Research › peer-review
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Poor self-rated health did not increase risk of permanent nursing placement or mortality in people with mild Alzheimer’s disease
Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Waldemar, Gunhild & Waldorff, Frans Boch, 2016, In: B M C Geriatrics. 16, 87Research output: Contribution to journal › Journal article › Research › peer-review
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Postoperative Cognitive Dysfunction in Middle-aged Patients
Johnson, T., Monk, T., Rasmussen, L. S., Abildstrøm, H., Houx, P., Korttila, K., Kuipers, H. M., Hanning, C. D., Siersma, Volkert Dirk, Kristensen, D., Canet, J., Ibanaz, M. T. & Møller, J. T., 2002, In: Anesthesiology. 96, p. 1351-7Research output: Contribution to journal › Journal article › Research › peer-review
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Postoperative Cognitive Dysfunction: Overinterpretation of Data?: In Reply:-
Johnson, T., Rasmussen, L., Korttila, K., Siersma, Volkert Dirk & Canet, J., 2003, In: Anesthesiology. 98, p. 1295Research output: Contribution to journal › Journal article › Research › peer-review
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Postoperative cognitive dysfunction: true deterioration versus random variation
Rasmussen, L. S. & Siersma, Volkert Dirk, 2004, In: Acta Anaesthesiologica Scandinavica. 48, p. 1137-1143Research output: Contribution to journal › Journal article › Research › peer-review
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Pre-diagnostic trajectories of lymphocytosis predict time to treatment and death in patients with chronic lymphocytic leukemia
Andersen, M. A., Grand, Mia Klinten, Brieghel, C., Siersma, Volkert Dirk, Andersen, Christen Bertel L & Niemann, Carsten, 2022, In: Communications Medicine. 2, 8 p., 50.Research output: Contribution to journal › Journal article › Research › peer-review
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Pre-test probability of urinary tract infection in dogs with clinical signs of lower urinary tract disease
Sørensen, Tina Møller, Holmslykke, M., Nordlund, M., Siersma, Volkert Dirk & Jessen, Lisbeth Rem, 2019, In: Veterinary Journal. 247, p. 65-70 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Predictors of lower-extremity amputation in patients with an infected diabetic foot ulcer
Pickwell, K., Siersma, Volkert Dirk, Kars, M., Apelqvist, J., Bakker, K., Edmonds, M., Holstein, P., Jirkovska, A., Jude, E., Mauricio, D., Piaggesi, A., Ragnarson Tennvall, G., Reike, H., Spraul, M., Uccioli, L., Urbancic, V., van Acker, K., van Baal, J. & Schaper, N., May 2015, In: Diabetes Care. 38, 5, p. 852-857 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Predictors of mortality of patients newly diagnosed with clinical type 2 diabetes: a 5-year follow up study
Olivarius, Niels de Fine, Siersma, Volkert Dirk, Nielsen, Anni Brit Sternhagen, Hansen, L. J., Rosenvinge, L. & Mogensen, C. E., 1 Jan 2010, In: B M C Endocrine Disorders. 10, p. 14Research output: Contribution to journal › Journal article › Research › peer-review
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Predictors of undiagnosed prevalent type 2 diabetes: The Danish General Suburban Population Study.
Heltberg, Andreas Søndergaard, Andersen, John Sahl, Sandholdt, H., Siersma, Volkert Dirk, Kragstrup, Jakob & Ellervik, Christina, Feb 2018, In: Primary Care Diabetes. 12, 1, p. 13-22 10 p., 28964672.Research output: Contribution to journal › Journal article › Research › peer-review
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Predictors of visual outcome in patients operated for craniopharyngioma - a Danish national study
Jacobsen, M. F., Thomsen, A. S. S., Bach-Holm, Daniella, Doroudian, G., Nissen, K. R., Fugleholm, Kåre, Poulsgaard, L., Siersma, Volkert Dirk & Heegaard, Steffen, Feb 2018, In: Acta Ophthalmologica. 96, 1, p. 39-45Research output: Contribution to journal › Journal article › Research › peer-review
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Prehospital treatment of opioid overdose in Copenhagen--is it safe to discharge on-scene?
Rudolph, S. S., Jehu, G., Nielsen, S. L., Nielsen, K., Siersma, Volkert Dirk & Rasmussen, L. S., 2011, In: Resuscitation. 82, 11, p. 1414-1418 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Premorbid risk factors influencing labour market attachment after mild traumatic brain injury: a national register study with long-term follow-up
Graff, H. J., Siersma, Volkert Dirk, Møller, Anne, Kragstrup, Jakob, Andersen, L. L., Egerod, Ingrid Eugenie & Rytter, Hana Malá, 2019, In: BMJ Open. 9, 10 p., e027297.Research output: Contribution to journal › Journal article › Research › peer-review
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Prescribing style and variation in antibiotic prescriptions for sore throat: cross-sectional study across six countries
Cordoba Currea, Gloria Cristina, Siersma, Volkert Dirk, Lopez-Valcarcel, B. G., Bjerrum, Lars, Llor, C., Aabenhus, Rune Munck & Mäkelä, Marjukka, 29 Jan 2015, In: B M C Family Practice. 16, p. 1-8 8 p., 7.Research output: Contribution to journal › Journal article › Research › peer-review
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Prevalence and clinical significance of neutropenia discovered in routine complete blood cell counts: a longitudinal study
Andersen, Christen Bertel L, Tesfa, D., Siersma, Volkert Dirk, Sandholdt, H., Hasselbalch, H., Bjerrum, O. W., Felding, P., Lind, B., Olivarius, Niels de Fine & Palmblad, J., 2016, In: Journal of Internal Medicine. 279, 6, p. 566-575Research output: Contribution to journal › Journal article › Research › peer-review
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Prevalence and progression of visual impairment in patients newly diagnosed with clinical type 2 diabetes: a 6-year follow up study
Olivarius, Niels de Fine, Siersma, Volkert Dirk, Almind, G. J. & Nielsen, N. V., 2011, In: B M C Public Health. 11, 80Research output: Contribution to journal › Journal article › Research › peer-review
ID: 3512987
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Maternal stress and placental function, a study using questionnaires and biomarkers at birth
Research output: Contribution to journal › Journal article › Research › peer-review
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329
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Clinical indications for antibiotic use in Danish general practice: results from a nationwide electronic prescription database
Research output: Contribution to journal › Journal article › Research › peer-review
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326
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Biomonitoring of Danish school children and mothers including biomarkers of PBDE and glyphosate
Research output: Contribution to journal › Journal article › Research › peer-review
Published