- Correspondence to Professor Georg Schett, Department of Internal Medicine 3, Rheumatology and Immunology, University of Erlangen-Nuremberg, Ulmenweg 18, Erlangen 91054, Germany;
- Received October 25, 2015
- Revised December 28, 2015
- Accepted January 31, 2016
- First published February 25, 2016.
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