The National Patient Register: Socialstyrelsen; [Available from: https://www.socialstyrelsen.se/en/statistics-and-data/registers/national-patient-register/). .

Ludvigsson JF, Andersson E, Ekbom A, Feychting M, Kim JL, Reuterwall C, et al. External review and validation of the Swedish national inpatient register. BMC Public Health. 2011;11:450.

Article  PubMed  PubMed Central  Google Scholar 

Socialstyrelsen. Production and Quality of the National Patient Regitster 2023 [Available from: https://www.socialstyrelsen.se/globalassets/sharepoint-dokument/dokument-webb/statistik/production-and-quality-of-the-patient-register.pdf.

Bramer W Fau - Bain P, Bain P. Updating search strategies for systematic reviews using EndNote. (1558–9439 (Electronic)).

Bramer Wm Fau - Giustini D, Giustini D Fau - de Jonge GB, de Jonge Gb Fau - Holland L, Holland L Fau - Bekhuis T, Bekhuis T. De-duplication of database search results for systematic reviews in EndNote. (1558–9439 (Electronic)).

Ohman L, Johansson M, Jansson JH, Lind M, Johansson L. Positive predictive value and misclassification of diagnosis of pulmonary embolism and deep vein thrombosis in Swedish patient registries. Clin Epidemiol. 2018;10:1215–21.

Article  PubMed  PubMed Central  Google Scholar 

Iacobaeus E, Burkill S, Bahmanyar S, Hakim R, Bystrom C, Fored M, et al. The national incidence of PML in Sweden, 1988–2013. Neurology. 2018;90(6):e498–506.

Article  PubMed  PubMed Central  Google Scholar 

Friberg L, Skeppholm M. Usefulness of Health Registers for detection of bleeding events in outcome studies. Thromb Haemost. 2016;116(6):1131–9.

PubMed  Google Scholar 

Kamal W, Bjornsdottir S, Kampe O, Trolle LY. Concordance between ICD-10 codes and clinical diagnosis of hypoparathyroidism in Sweden. Clin Epidemiol. 2020;12:327–31.

Article  PubMed  PubMed Central  Google Scholar 

Giunta DH, Karlsson P, Younus M, Berglind IA, Kieler H, Reutfors J. Validation of diagnoses of liver disorders in users of systemic azole antifungal medication in Sweden. BMC Gastroenterol. 2024;24(1):21.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Abildgaard N, Freilich J, Anttila P, Bent-Ennakhil N, Ma Y, Lassenius M, et al. Use of linked nordic registries for population studies in hematologic cancers: the case of multiple myeloma. Clin Epidemiol. 2023;15:987–99.

Article  PubMed  PubMed Central  Google Scholar 

Olsson DS, Andersson E, Bryngelsson IL, Nilsson AG, Johannsson G. Excess mortality and morbidity in patients with craniopharyngioma, especially in patients with childhood onset: a population-based study in Sweden. J Clin Endocrinol Metab. 2015;100(2):467–74.

Article  CAS  PubMed  Google Scholar 

Andersson T, Isaksson A, Khalil H, Lapidus L, Carlberg B, Soderberg S. Validation of the Swedish national inpatient register for the diagnosis of pulmonary embolism in 2005. Pulm Circ. 2022;12(1): e12037.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Schaufelberger M, Ekestubbe S, Hultgren S, Persson H, Reimstad A, Schaufelberger M, et al. Validity of heart failure diagnoses made in 2000–2012 in western Sweden. ESC Heart Fail. 2020;7(1):36–45.

PubMed  Google Scholar 

Gedeborg R, Holm L, Feltelius N, Sundström A, Eggers KM, Nurminen ML, et al. Validation of myocarditis diagnoses in the Swedish patient register for analyses of potential adverse reactions to COVID-19 vaccines. LID - https://doi.org/10.48101/ujms.v128.9290 [doi]. (2000–1967 (Electronic)).

Tampe U, Frank S, Weiss RJ, Jansson KA. Diagnosis of open tibial fracture showed high positive predictive value in the swedish national patient register. Clin Epidemiol. 2020;12:1113–9.

Article  PubMed  PubMed Central  Google Scholar 

Stalfors J, Enoksson F, Hermansson A, Hultcrantz M, Robinson A, Stenfeldt K, et al. National assessment of validity of coding of acute mastoiditis: a standardised reassessment of 1966 records. Clin Otolaryngol. 2013;38(2):130–5.

Article  CAS  PubMed  Google Scholar 

Mahmood MW, Schmidt PT, Olen O, Hellsing C, Hjern F, Abraham-Nordling M. Identification of diverticular disease in Swedish healthcare registers: a validation study. Scand J Gastroenterol. 2024;59(2):176–82.

Article  PubMed  Google Scholar 

Schollin Ask L, Svensson JF, Olen O, Ortqvist A. Clinical presentation of intussusception in Swedish children under 3 years of age and the validity of diagnostic coding. Pediatr Surg Int. 2019;35(3):373–81.

Article  PubMed  Google Scholar 

Razavi D, Ljung R, Lu Y, Andren-Sandberg A, Lindblad M. Reliability of acute pancreatitis diagnosis coding in a National Patient Register: a validation study in Sweden. Pancreatology. 2011;11(5):525–32.

Article  PubMed  Google Scholar 

Munch T, Christensen LB, Adelborg K, Tell GS, Apalset EM, Westerlund A, et al. Positive predictive values of ICD-10 codes to identify incident acute pancreatitis and incident primary malignancy in the Scandinavian national patient registries among women with postmenopausal osteoporosis. Clin Epidemiol. 2017;9:411–9.

Article  PubMed  PubMed Central  Google Scholar 

Ahsberg K, Ye W, Lu Y, Zheng Z, Stael von Holstein C. Hospitalisation of and mortality from bleeding peptic ulcer in Sweden: a nationwide time-trend analysis. Aliment Pharmacol & Therapeutics. 2011;33(5):578–84.

Article  CAS  Google Scholar 

Inghammar M, Engstrom G, Kahlmeter G, Ljungberg B, Lofdahl CG, Egesten A. Invasive pneumococcal disease in patients with an underlying pulmonary disorder. Clin Microbiol Infect. 2013;19(12):1148–54.

Article  CAS  PubMed  Google Scholar 

Inghammar M, Engstrom G, Lofdahl CG, Egesten A. Validation of a COPD diagnosis from the Swedish inpatient registry. Scandinavian journal of public health. 2012;40(8):773–6.

Article  PubMed  Google Scholar 

Reutfors J, Bahmanyar S, Jonsson EG, Ekbom A, Nordstrom P, Brandt L, et al. Diagnostic profile and suicide risk in schizophrenia spectrum disorder. Schizophr Res. 2010;123(2–3):251–6.

Article  PubMed  Google Scholar 

Allebeck PA-O, Gunnarsson T, Lundin AA-O, Löfving S, Dal H, Zammit S. Does a history of cannabis use influence onset and course of schizophrenia? (1600–0447 (Electronic)).

Sellgren C, Landen M, Lichtenstein P, Hultman CM, Langstrom N. Validity of bipolar disorder hospital discharge diagnoses: file review and multiple register linkage in Sweden. Acta Psychiatr Scand. 2011;124(6):447–53.

Article  CAS  PubMed  Google Scholar 

Bergstrom MF, Byberg L, Melhus H, Michaelsson K, Gedeborg R. Extent and consequences of misclassified injury diagnoses in a national hospital discharge registry. Inj Prev. 2011;17(2):108–13.

Article  PubMed  Google Scholar 

Sudow H, Sjodin L, Mellstrand NC. Validity of distal radius fracture diagnoses in the Swedish National Patient Register. Eur J Med Res. 2023;28(1):335.

Article  PubMed  PubMed Central  Google Scholar 

Wallman JK, Alenius GM, Klingberg E, Sigurdardottir V, Wedren S, Exarchou S, et al. Validity of clinical psoriatic arthritis diagnoses made by rheumatologists in the Swedish National Patient Register. Scand J Rheumatol. 2023;52(4):374–84.

Article  CAS  PubMed  Google Scholar 

Lindstrom U, Exarchou S, Sigurdardottir V, Sundstrom B, Askling J, Eriksson JK, et al. Validity of ankylosing spondylitis and undifferentiated spondyloarthritis diagnoses in the Swedish National Patient Register. Scand J Rheumatol. 2015;44(5):369–76.

Article  CAS  PubMed  Google Scholar 

Waldenlind K, Eriksson JK, Grewin B, Askling J. Validation of the rheumatoid arthritis diagnosis in the Swedish National Patient Register: a cohort study from Stockholm County. BMC Musculoskelet Disord. 2014;15:432.

Article  PubMed  PubMed Central  Google Scholar 

Bergdahl J, Jarnbring F, Ehrenstein V, Gammelager H, Granath F, Kieler H, et al. Evaluation of an algorithm ascertaining cases of osteonecrosis of the jaw in the Swedish National Patient Register. Clin Epidemiol. 2013;5:1–7.

Article  PubMed  PubMed Central  Google Scholar 

Kouppis E, Ekselius L. Validity of the personality disorder diagnosis in the Swedish National Patient Register. Acta Psychiatr Scand. 2020;141(5):432–8.

Article  CAS  PubMed  Google Scholar 

Aberg F, Shang Y, Strandberg R, Wester A, Widman L, Hagstrom H. Four-fold increased mortality rate in patients with Wilson’s disease: A population-based cohort study of 151 patients. United European gastroenterology journal. 2023;11(9):852–60.

Article  PubMed  PubMed Central  Google Scholar 

Basic C, Rosengren A, Lindstrom S, Schaufelberger M. High validity of cardiomyopathy diagnoses in western Sweden (1989–2009). ESC Heart Fail. 2018;5(2):233–40.

Article  PubMed