1. Stanford University, Stanford, and VA Palo Alto Health Care System; Palo Alto California
2. University of Pittsburgh; Pittsburgh Pennsylvania
3. Stanford University; Stanford California
4. University of Massachusetts; Worcester
5. Medical University of South Carolina; Charleston
6. Medical College of Wisconsin; Milwaukee
7. University of Pennsylvania; Philadelphia
8. National Jewish Health Center; Denver Colorado
9. University of Utah; Salt Lake City
10. University of California; Los Angeles
11. University of Chicago; Chicago Illinois
12. Northwestern University; Chicago Illinois
13. University of Medicine and Dentistry of New Jersey; Rutgers
14. Johns Hopkins University; Baltimore Maryland
15. University of Michigan; Ann Arbor
16. University of Minnesota; Minneapolis
17. Tufts University School of Medicine; Boston Massachusetts
18. Center for Rheumatology; Albany New York
19. Boston University; Boston Massachusetts
20. Hospital for Special Surgery; New York New York
21. Georgetown University; Washington DC