- Correspondence to Dr Annette H M van der Helm-van Mil, Department of Rheumatology, Leiden University Medical Center, P.O. Box 9600, Leiden 2300 RC, The Netherlands;
- Received May 5, 2016
- Revised August 18, 2016
- Accepted September 17, 2016
- First published October 6, 2016.
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