- Correspondence to Dr Gerd R Burmester, Department of Rheumatology and ClinicaI Immunology, Charité-Universitätsmedizin Berlin, Charitéplatz 1, Berlin 10117, Germany;
- Received February 25, 2013
- Revised June 13, 2013
- Accepted July 9, 2013
- First published July 31, 2013.
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