1. University of Rochester Rochester New York USA
2. University of New Mexico Albuquerque New Mexico USA
3. Emory University Atlanta Georgia USA
4. Massachusetts General Hospital Boston Massachusetts USA
5. UMass Memorial Medical Center Worcester Massachusetts USA
6. University of Illinois College of Medicine–Peoria/OSF Healthcare Peoria Illinois USA
7. UT Southwestern Medical Center Dallas Texas USA
8. Harbor–UCLA Medical Center Los Angeles California USA