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Contributors Study concept and design and drafting of the manuscript: WPN, AHMvdH-vM. Acquisition, analysis or interpretation of data and critical revision of the manuscript for important intellectual content: WPN, MPTdW, AB, AHMvdH-vM. Statistical analysis: WPN.
Funding This work was supported by the Dutch Arthritis Foundation and the Netherlands Organization for Health Research and Development (Vidi grant).
Competing interests None declared.
Ethics approval Medical ethical committee of the Leiden University Medical Center.
Provenance and peer review Not commissioned; externally peer reviewed.
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