- Correspondence to Polina Putrik, Department of Internal Medicine, Division of Rheumatology, Maastricht University Medical Center and CAPHRI, Maastricht University, PO Box 616, 6200 MD, Maastricht, the Netherlands;
- Received October 5, 2014
- Revised December 2, 2014
- Accepted January 6, 2015
- First published January 28, 2015.
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