1. Queen Elizabeth II Health Sciences Centre and Dalhousie University; Halifax Nova Scotia Canada
2. Institute of Public Health and University of Cambridge, University Forvie Site; Cambridge UK
3. Toronto Western Hospital and University of Toronto; Toronto, Ontario Canada
4. Instituto Nacional de Ciencias Médicas y Nutrición; Mexico City Mexico
5. University of Birmingham, College of Medical and Dental Sciences; Birmingham UK
6. Hanyang University Hospital for Rheumatic Diseases; Seoul Republic of Korea
7. McGill University Health Centre; Montreal Quebec Canada
8. University of Calgary; Calgary Alberta Canada
9. Cedars-Sinai Medical Center and University of California, Los Angeles, David Geffen School of Medicine
10. Oklahoma Medical Research Foundation; Oklahoma City
11. University College London; London UK
12. State University of New York Downstate Medical Center; Brooklyn
13. Johns Hopkins University School of Medicine; Baltimore Maryland
14. Arthritis Research UK Epidemiology Unit, Manchester Academic Health Sciences Centre, University of Manchester, NIHR Manchester Musculoskeletal Biomedical Research Unit, Central Manchester University Hospitals NHS Foundation Trust, and Manchester Academic Health Science Centre; Manchester UK
15. University of North Carolina; Chapel Hill
16. Centre Hospitalier Universitaire de Québec and Université Laval; Quebec City Canada
17. Landspitali University Hospital; Reykjavik Iceland
18. Northwestern University Feinberg School of Medicine; Chicago Illinois
19. The Rayne Institute, St Thomas' Hospital, King's College London School of Medicine; London UK
20. Feinstein Institute for Medical Research; Manhasset New York
21. University of Alabama at Birmingham
22. University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
23. University Hospital Lund; Lund Sweden
24. Lanarkshire Centre for Rheumatology, Hairmyres Hospital; East Kilbride UK
25. Karolinska Institute; Stockholm Sweden
26. Institut d'Investigacions Biomèdiques August Pi i Sunyer, Hospital Clínic; Barcelona, Spain
27. BioCruces Health Research Institute, Hospital Universitario Cruces, University of the Basque Country; Barakaldo Spain
28. Emory University School of Medicine; Atlanta Georgia
29. University of California at San Diego; La Jolla
30. Istanbul University; Istanbul Turkey
31. Medical University of South Carolina; Charleston
32. University of Manitoba; Winnipeg Manitoba Canada
33. Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
34. Hospital for Joint Diseases, New York University, Seligman Centre for Advanced Therapeutics; New York New York