- 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 March 20, 2015
- Revised October 1, 2015
- Accepted October 3, 2015
- First published October 28, 2015.
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- Data supplement 1 - Online supplement
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