- Correspondence to Dr Gerd-Rűdiger Burmester, Department of Rheumatology and Clinical Immunology, Charité—University Medicine Berlin, Charitéplatz 1, Berlin 10117, Germany;
- Received October 16, 2013
- Revised January 20, 2014
- Accepted January 24, 2014
- First published February 18, 2014.
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