1. Division of Rheumatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
2. Cedars-Sinai Medical Center, David Geffen School of Medicine at UCLA, Los Angeles, USA
3. Toronto Western Hospital, Toronto, Ontario, Canada
4. Department of Dermatology, Philadelphia V.A. Medical Center, University of Pennsylvania School of Medicine, Philadelphia, USA
5. North Dallas Dermatology Associates, Dallas, TX, USA
6. Department of Rheumatology, The Medical School, University of Birmingham, Birmingham, UK
7. Department of Medicine, Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, Birmingham, AL, USA
8. Northwestern University, Feinberg School of Medicine, Chicago, IL, USA
9. Department of Rheumatology, Ysbyty Gwynedd, North Wales, UK
10. Division of Clinical Epidemiology, McGill University, Montreal, Quebec, Canada
11. Department of Medicine, Division of Rheumatology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
12. Department of Rheumatology, The Hospital for Rheumatic Diseases, Hanyang University, Seoul, Korea
13. Department of Clinical Pharmacology, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
14. Department of Medicine, SUNY Downstate Medical Center, Brooklyn, NY, USA
15. Division of Rheumatology, Departments of Medicine and Pathology, Capital Health and Dalhousie University, Halifax, Nova Scotia, Canada
16. Department of Rheumatology, University Hospital, Lund, Sweden
17. Instituto Nacional de Ciencias Medicas y Nutricion SZ, Department of Immunology and Rheumatology, Mexico
18. ARC Epidemiology Unit, University of Manchester, Manchester, UK
19. Feinstein Institute for Medical Research, Manhasset, NY, USA
20. Centre for Rheumatology Research, Division of Medicine, London, UK
21. Lanarkshire Centre for Rheumatology, Hairmyres Hospital, East Kilbride, Scotland, UK
22. Department of Epidemiology and Preventive Medicine, University of Maryland, Baltimore, MD, USA
23. NYU Medical Center, New York, NY, USA
24. Division of Rheumatology, Allergy and Immunology, UCSD School of Medicine, LaJolla, CA, USA
25. Thurston Arthritis Research Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
26. Landspitali, University Hospital, Department of Rheumatology and Center for Rheumatology Research, Reykjavik, Iceland
27. Department of Rheumatology, Karolinska University Hospital, Stockholm, Sweden
28. Chefarzt Rheumatologie und Rehabilitation, Kantonsspital Schaffhausen, Schaffhausen, Switzerland
29. Cedars-Sinai Medical Center, Los Angeles, CA, USA