1. Faculty of Medicine, McGill University, Montreal, Canada
2. Division of Clinical Epidemiology, Research Institute of the McGill University Health Center, Montreal, Canada
3. Feinberg School of Medicine, Northwestern University, Chicago, USA
4. Division of Rheumatology, Johns Hopkins University School of Medicine, Baltimore, USA
5. Center for Prognosis Studies in the Rheumatic Diseases, Toronto Western Hospital and University of Toronto, Toronto, Canada
6. Division of Rheumatology, Centre de recherche du CHU de Québec—Université Laval, Quebec City, Canada
7. State University of New York—Downstate Medical Center, New York, USA
8. Instituto Nacional de Ciencias Medicas y Nutrición, Mexico City, Mexico
9. University of Manitoba, Winnipeg, Canada
10. Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
11. Division of Rheumatology, Dalhousie University and Nova Scotia Health Authority, Halifax, Canada
12. Rheumatology Research Group, Institute for Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham: Rheumatology department, City Hospital, Sandwell and West Birmingham Hospitals NHS Trust and NIHR/Wellcome Trust Clinical Research Facility, Queen Elizabeth Hospital Birmingham; University Hospital Birmingham NHS Foundation Trust, Birmingham, UK
13. Department of Rheumatology, Institution of Clinical Sciences, Lund University Hospital, Lund, Sweden
14. Department of Medicine, University of California, San Francisco, USA
15. Centre for Rheumatology Research, University College London, London, UK
16. The Hospital for Rheumatic Diseases, Hanyang University, Seoul, Korea
17. Department of Clinical Immunology, Hannover Medical School, Hannover, Germany
18. Autoimmune Diseases Research Unit, Department Of Internal Medicine, Hospital Universitario Cruces, University Of The Basque Country, Bizkaia, Spain
19. Feinstein Institute for Medical Research, New York, USA
20. Division of Rheumatology and Immunology, Medical University of South Carolina, Charleston, USA
21. Departments of Oncology, Human Genetics and Medicine, McGill University, Montreal, Canada
22. Department of Therapeutic Radiology, Yale School of Medicine, New Haven, USA
23. Department of Anatomical Pathology, University of British Colombia, Vancouver, Canada
24. Division of Rheumatology, University of Calgary, Calgary, Canada