1. National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH; Bethesda Maryland
2. Oregon Health & Science University; Portland
3. American University of Beirut, Beirut, Lebanon, and McMaster University; Hamilton Ontario Canada
4. University of California; San Francisco
5. Brigham and Women's Hospital; Boston Massachusetts
6. University of Wisconsin; Madison
7. Arthritis and Rheumatism Associates; Washington DC
8. Children's Hospital of Philadelphia and University of Pennsylvania; Philadelphia
9. University of Toronto; Toronto Ontario Canada
10. University of Mississippi Medical Center; Jackson
11. University of Alberta; Edmonton Alberta Canada
12. American College of Rheumatology; Atlanta Georgia
13. Vancouver; British Columbia Canada
14. Hospital for Special Surgery; New York New York
15. Cedars-Sinai Medical Center; Beverly Hills California
16. VA Long Beach Medical Center, Long Beach, California, and University of California; Irvine
17. Oregon Health & Science University and Legacy Devers Eye Institute; Portland
18. University of Massachusetts; Worcester
19. University of Ghent; Ghent Belgium
20. University of California; Los Angeles
21. University of Texas Health Sciences Center at Houston
22. Denver VA Medical Center, Denver, Colorado, and University of Colorado; Aurora