- Correspondence to Dr Gerd R Burmester, Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, Free University and Humboldt University of Berlin, Charitéplatz 1, Berlin 10117, Germany;
- Received September 20, 2016
- Revised February 10, 2017
- Accepted March 2, 2017
- First published April 7, 2017.
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