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Handling editor Josef S Smolen
Contributors JM, MW-H and GN conceived the study, with additional support from EB and KES. MK, HF-dE, SM-B, PE, TM and GN extracted register data. JM analysed the data with input from MW-H and GN. JM wrote the first manuscript with input from MW-H, GN and EB. All authors participated in the editing of the manuscript until its final version.
Funding The study was supported by grants from the Swedish Research Council, the Swedish Rheumatism Association, the King Gustaf the V's 80-year foundation, the Heart-Lung Foundation, the Freemason’s in Stockholm Foundation for Children’s Welfare, the Stockholm County Council, the Karolinska Institute and the Torsten and Ragnar Söderberg Foundation.
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval The study was approved by the Regional Ethics Committee in Stockholm, and patients gave written informed consent.
Provenance and peer review Not commissioned; externally peer reviewed.
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