1. University of Michigan Ann Arbor
2. Mount Sinai Hospital and University Health Network Toronto Ontario Canada
3. Stanford University School of Medicine Palo Alto California
4. Geisel School of Medicine at Dartmouth Hanover New Hampshire
5. Royal Free Campus London UK
6. University of Minnesota Minneapolis
7. MedStar Georgetown University Hospital Washington DC
8. Pittsburgh University Medical Center Pittsburgh Pennsylvania
9. Boston University School of Medicine Boston Massachusetts
10. David Geffen School of Medicine at University of California Los Angeles
11. University of Utah Salt Lake City
12. Robert Wood Johnson University New Brunswick New Jersey
13. University of Pittsburgh Pittsburgh Pennsylvania
14. University of Western Ontario London Ontario Canada
15. Hospital for Special Surgery New York New York
16. University of Texas McGovern Medical School Houston
17. Perelman School of Medicine at the University of Pennsylvania Pittsburgh
18. Seattle Rheumatology Associates Seattle Washington
19. Medical University of South Carolina Charleston
20. Columbia University New York New York
21. Cleveland Clinic Cleveland Ohio
22. Harvard Medical School Boston Massachusetts
23. Ohio State University Wexner Medical Center Columbus
24. Hôpital Cochin Paris France
25. University of Florence Florence Italy
26. University Hospital Zurich Zurich Switzerland
27. University of California Los Angeles