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