- Correspondence to Professor Jürgen Braun, Rheumazentrum Ruhrgebiet, Claudiusstr. 45, Herne 44649, Germany; and Professor Dae Hyun Yoo, Division of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, 222-1 Wangsimni-Ro, Seongdong-Gu, Seoul 04763, Republic of Korea;
- Received October 16, 2015
- Revised March 22, 2016
- Accepted March 23, 2016
- First published April 26, 2016.
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