- Correspondence to Dr Gerd R Burmester, Director, Department of Rheumatology and Clinical Immunology, Charité—University Medicine Berlin, Free University, and Humboldt University Berlin Charitéplatz 1, Berlin 10117, Germany;
- Received September 30, 2016
- Revised December 9, 2016
- Accepted January 16, 2017
- First published February 17, 2017.
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