1. University of Pennsylvania; Philadelphia
2. University of Otago; Wellington New Zealand
3. Boston University School of Medicine; Boston Massachusetts
4. VieCuri Medical Centre, Venlo, The Netherlands, and Scientific IQ HealthCare, Radboud University Medical Center; Nijmegen The Netherlands
5. Chiang Mai University; Chiang Mai Thailand
6. Hospital General de México; Mexico City Mexico
7. Nasonova Research Institute of Rheumatology of Russia; Moscow Russia
8. University College Dublin and Mater Misericordiae University Hospital; Dublin Ireland
9. University of Otago Christchurch; Christchurch New Zealand
10. Hospital Universitario Cruces, BioCruces Health Research Institute, and Basque Country University; Barakaldo Spain
11. Hospital General Universitario de Elda; Alicante Spain
12. Université Paris Diderot, INSERM UMR 1132 and Service de Rhumatologie, Hôpital Lariboisière, AP-HP; Paris France
13. Westfries Gasthuis; Hoorn The Netherlands
14. University of Pavia and IRCCS Policlinico San Matteo Foundation, Pavia, Italy, and Skane University Hospital Malmö/Lund; Lund Sweden
15. University of Pavia and IRCCS Policlinico San Matteo Foundation; Pavia Italy
16. Taichung Veterans’ General Hospital; Taichung Taiwan Republic of China
17. University Hospital Carl Gustav Carus; Dresden Germany
18. Universidade do Estado do Rio de Janeiro; Rio de Janeiro Brazil
19. Rijnstate Hospital; Arnhem The Netherlands
20. China Medical University Hospital; Taichung Taiwan Republic of China
21. Copenhagen University Hospital Glostrup; Glostrup Denmark
22. Riverside Professional Centre; Sydney Nova Scotia Canada
23. Waikato District Health Board and Waikato Clinical School; Hamilton New Zealand
24. University of Genoa; Genoa Italy
25. Diakonhjemmet Hospital; Oslo Norway
26. University of Auckland; Auckland New Zealand