- Correspondence to Professor Thomas Dörner, Department of Rheumatology and Clinical Immunology, Charité Universitätsmedizin Berlin, Charitéplatz 1—Berlin 10117, Germany;
- Received April 5, 2016
- Revision received October 22, 2016
- Accepted November 1, 2016
- First published December 30, 2016.
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