1. University of Miami Miller School of Medicine; Miami Florida
2. Methodist DeBakey Heart and Vascular Institute; Houston Texas
3. Winthrop University Hospital; New York New York
4. Harvard Clinical Research Institute; Boston Massachusetts
5. Columbia University Medical Center/New York-Presbyterian Hospital; New York New York
6. Duke University Medical Center; Durham North Carolina
7. Peter Munk Cardiac Centre; University Health Network; Toronto ON Canada
8. Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts
9. Beth Israel Medical Deaconess Harvard Medical School; Boston Massachusetts
10. Henry Ford Hospital; Detroit Michigan