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Transmission of rheumatoid arthritis through blood transfusion: a retrospective cohort study

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Footnotes

  • Handling editor Josef S Smolen

  • Contributors All authors have contributed substantially in the process of completing this study. Conception of the study: SAJ, KR, JA, GE, HL, HH. Designing the study: SAJ, KR, JA, GE, HL, HH. Aggregation of data: KR, GE, HH, KT, CE, HU, OBP, KRN. Interpretation of data: all authors. Drafting and revising, final approval and agreement to be accountable: all authors.

  • Funding SAJ is supported by grants from The Danish Rheumatism Association and Odense University Hospital PhD Fund and Fund for clinical research. HH is supported by grants from The Danish Rheumatism Association and Nordic Cancer Union. JA has received grant support from the Swedish Foundation for Strategic Research, the Swedish Research Council and ALF.

  • Competing interests JA has received grants from Abbvie, BMS, Merck, Pfizer, Roche, Samsung and UCB, mainly for safety monitoring via the Swedish ARTIS system.

  • Patient consent Not required.

  • Ethics approval The conduct of this study was approved by the regional ethics review board at Karolinska Institutet in Stockholm, Sweden (reference nos. 2009/1011, 2012/1233, 2013/37 and 2013/787), and by the Danish Data protection agency (reference nos. 2008-54-0472 and 2008-58-0035).

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement The data from the Scandinavian Donations and Transfusions (SCANDAT2) database, constituting the basis for this study, cannot be shared due to Danish and Swedish law.

  • Correction notice This article has been corrected since it published Online First. The author affiliation numbering has been corrected.