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Contributors LD conceived the study. LD, LM and RC designed the study. LD and LM acquired the data. RC performed the analysis. All authors contributed to the interpretation of data. RC drafted the manuscript and all authors revised the article critically for intellectual content and final approval of the article to be published. LD is the guarantor for the study.
Funding The Danish Rheumatism Association and Danish Cancer Society.
Competing interests None.
Ethics approval The project is entirely register based, and the patients have not been contacted. Therefore, no approval by the ethics committees was needed according to the Danish law. Approval by the Danish Data Protection Board Agency was obtained.
Provenance and peer review Not commissioned; externally peer reviewed.