- Correspondence to Dr Falk Hiepe, Department of Rheumatology and Clinical Immunology, Charité - Universiätsmedizin Berlin, Charitéplatz 1, D-10117 Berlin, Germany;
- Received February 11, 2013
- Revised July 10, 2013
- Accepted August 20, 2013
- First published October 10, 2013.
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