1. St. Maartenskliniek and Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
2. University of Michigan; Ann Arbor
3. Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
4. Toronto Western Hospital, Mount Sinai Hospital, and University of Toronto; Toronto, Ontario Canada
5. Jewish General Hospital and McGill University; Montreal, Quebec Canada
6. Felix Platter Spital and University of Basel; Basel Switzerland
7. University of Florence; Florence Italy
8. Auckland City Hospital and New Zealand Health Ministry; Auckland New Zealand
9. University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
10. Hospital Universitario 12 de Octubre; Madrid Spain
11. Charité University Medicine Berlin, German Rheumatology Research Center, and Leibniz Institute; Berlin Germany
12. University of California, Los Angeles, David Geffen School of Medicine; Los Angeles
13. Royal Free Hospital and University College London Medical School; London UK
14. University Hospital Zurich; Zurich Switzerland
15. Université Paris Descartes and Hôpital Cochin; AP-HP, Paris France
16. Clinica Medica Università Politecnica delle Marche; Ancona Italy
17. University of Texas Health Science Center-Houston
18. Newcastle University Medical School; Newcastle upon Tyne UK
19. Scleroderma Research Consultants; Avon Connecticut
20. University of Pécs Medical Center; Pécs Hungary
21. Georgetown University School of Medicine; Washington DC
22. Istanbul University; Istanbul Turkey
23. Medical University of Bialystok; Bialystok Poland
24. Justus-Liebig University Giessen and Kerckhoff Clinic; Bad Nauheim Germany
25. Second University of Naples; Naples Italy
26. St. Vincent's University Hospital; Dublin Ireland
27. Stanford University School of Medicine; Stanford California
28. University of Colorado Medical School and Denver Health Medical Center; Denver Colorado
29. Medical College of Wisconsin; Milwaukee
30. University of Alabama at; Birmingham
31. University of Manchester; Manchester UK
32. Salford Royal National Health Service Foundation Trust; Salford UK
33. Rutgers Robert Wood Johnson Medical School; New Brunswick New Jersey
34. Thomas Jefferson University; Philadelphia Pennsylvania
35. University of Toledo; Toledo Ohio
36. Boston University School of Medicine; Boston Massachusetts
37. Medical University of South Carolina; Charleston
38. Northwestern University Feinberg School of Medicine; Chicago Illinois
39. St. Joseph's Health Care London and University of Western Ontario; London, Ontario Canada