- Correspondence to Dr Tanja Stamm, Department of Internal Medicine III, Division of Rheumatology, Medical University of Vienna, Währinger Gürtel 18-20, Vienna A - 1090, Austria;
- Received April 8, 2013
- Revised July 8, 2013
- Accepted July 14, 2013
- First published August 6, 2013.
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