- Correspondence to Professor Georg Schett, Department of Internal Medicine 3, Rheumatology and Immunology, University Clinic of Erlangen-Nuremberg, Ulmenweg 18, Erlangen 91054, Germany;
- Received May 8, 2015
- Revised September 22, 2015
- Accepted September 26, 2015
- First published October 19, 2015.
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- Data supplement 1 - Online figures
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