- Correspondence to Professor Dr Annette H M van der Helm-van Mil, Department of Rheumatology, Leiden University Medical Center, P.O. Box 9600, RC Leiden 2300, The Netherlands;
- Received May 29, 2016
- Revised September 1, 2016
- Accepted September 4, 2016
- First published September 22, 2016.
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