1. Dallas VA Medical Center; Dallas TX
2. Baylor University Medical Center; Dallas TX
3. University of Pennsylvania; Philadelphia PA
4. Yale University; New Haven CT
5. University of Colorado; Denver CO
6. University of Toronto; Toronto ON Canada
7. University of Texas; Houston TX
8. Emory University; Atlanta GA
9. Mayo Clinic; Rochester MN
10. Mercy Medical Center; Baltimore MD
11. Mayo Clinic; Scottsdale AZ
12. University of Rochester; Rochester NY
13. University of Alberta; Edmonton AB Canada
14. University of California, San Francisco; San Francisco CA
15. Virginia Commonwealth University and McGuire VA Medical Center; Richmond VA