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Funding The authors have received funding (project acronym EUTrain) from the 7th Framework programme of the EU, SP3-People, support for training and career development for researchers (Marie Curie), Network for Initial Training (ITN), FP7-PEOPLE-2011-ITN, under the Marie Skłodowska-Curie grant agreement No 289903, and the Dutch Arthritis Association.
Contributors TB, EH, HO, AM, BP and WJ: study design, drafting and revising the article; TvdB, WJ: statistical analysis; JM, RS and HO: lab analysis. EH, JS and BP: patient recruitment. All authors contributed to the development and critical review of the manuscript and approved the final version.
Competing interests None.
Ethics approval Local medical ethical committee of University Medical Center of Utrecht and Nijmegen.
Provenance and peer review Not commissioned; externally peer reviewed.
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