- Correspondence to Dr Tanja A Stamm, Department of Medicine 3, Division of Rheumatology, Medical University of Vienna, Währinger Gürtel 18-20 A, Vienna 1090, Austria;
- Received March 1, 2015
- Revised April 20, 2015
- Accepted April 30, 2015
- First published May 19, 2015.
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- Data supplement 1 - Online supplement
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