1. Wake Forest School of Medicine; Winston-Salem North Carolina
2. University of Alabama at; Birmingham
3. The Ohio State University Wexner Medical Center; Columbus
4. University of Florida; Gainesville
5. Brigham and Women's Hospital; Boston Massachusetts
6. University of California; San Francisco
7. Cincinnati Children's Hospital Medical Center and Cincinnati VA Medical Center; Cincinnati Ohio
8. Oklahoma Medical Research Foundation and University of Oklahoma Health Sciences Center; Oklahoma City
9. Medical University of South Carolina; Charleston
10. Emory University School of Medicine; Atlanta Georgia
11. Oklahoma Medical Research Foundation; Oklahoma City
12. Mayo Clinic; Rochester Minnesota
13. State University of New York Downstate Medical Center; Brooklyn
14. Johns Hopkins School of Medicine; Baltimore Maryland
15. Northwestern University, Feinberg School of Medicine; Chicago Illinois
16. University of Texas Health Science Center at; Houston
17. Hospital for Special Surgery and Weill Cornell Medical College; New York New York
18. University of California; Los Angeles
19. University of North Carolina at; Chapel Hill
20. Virginia Commonwealth University Medical Center; Richmond