1. University of Nebraska Medical Center, Omaha, Nebraska and VA Nebraska–Western Iowa Health Care System Omaha Nebraska
2. Toronto Western HospitalMount Sinai Hospital, and University of Toronto Toronto Ontario Canada
3. Berkshire Health Systems, Pittsfield, Massachusetts, and Yale University New Haven Connecticut
4. University of Texas Southwestern Medical Center Dallas
5. Brigham and Women's Hospital Boston Massachusetts
6. University of Alabama at Birmingham
7. Metroplex Clinical Research Center Dallas Texas
8. University of Nebraska Medical Center Omaha
9. Oregon Health and Science University Portland
10. American College of Rheumatology Atlanta Georgia