- Correspondence to Dr Alexandre Sepriano, Department of Rheumatology, Leiden University Medical Center, Albinusdreef 2, P.O. Box 9600, Leiden 2300 RC, The Netherlands;
- Received October 6, 2015
- Revised December 22, 2015
- Accepted January 16, 2016
- First published February 10, 2016.
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- Data supplement 1 - Online supplement
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