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Footnotes
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Contributors Study conception and design: JW, EB, LAvdS and DvS. Acquisition of data: LAvdS, DvS, MdS, BD-vdM and KMJJ. Analysis and interpretation of data: MdS, KMJJ, EB, AJvW, AV, JW and DvS. Drafting of manuscript: MdS. Critical revision: AJvW, AV, EB, JW and DvS.
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Funding This study was funded by the authors' institutions. The SAP cohort was supported by grants from the Netherlands Organization for Health Research and Development (ZonMw) (grant number 6100.0010) and the Dutch Arthritis Association (grant number 0801034).
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Competing interests None.
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Ethics approval Ethics Committee of the Slotervaart Hospital and the Jan van Breemen Institute, Amsterdam, The Netherlands.
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Provenance and peer review Not commissioned; externally peer reviewed.