1Department of Rheumatology, Ev. Krankenhaus Hagen-Haspe, Brusebrinkstrasse 20, 58135 Hagen, Germany
2Leiden University Medical Center, Leiden, The Netherlands.
3Maastricht University Medical Center, Maastricht, The Netherlands
4Dokuz Eylul University Hospital, Izmir, Turkey
5Rheumatology Private Practice, Berlin, Germany;
6Veterans General Hospital, Taipei, Taiwan
7Hospital Cochin, Paris, France
8Chinese PLA General Hospital, Beijing, China
9Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
10University of Ege, Izmir, Turkey;
11University Hospital, Ghent, Belgium
12San Carlo Hospital, Potenza, Italy
13King George Hospital, London, UK
14M Scarlato Hospital, Scafati, Italy
15University Hospital, Copenhagen, Denmark
16University Militar Hospital, Bogotá, Colombia
17Balgrist University Hospital, Zurich, Switzerland
18Chung Shan Medical University Taichung, Taiwan
19Department of Medicine, Charité – University Medicine, Berlin, Germany
20German Rheumatology Research Center, Berlin, Germany