1. Minneapolis Heart Institute and Minneapolis Heart Institute Foundation Abbott Northwestern Hospital Minneapolis Minnesota USA
2. Baylor Heart and Vascular Hospital Dallas Texas USA
3. Henry Ford Hospital Detroit Michigan USA
4. Cleveland Clinic Cleveland Ohio USA
5. Meshalkin Novosibirsk Research Institute Novosibirsk Russia
6. Beth Israel Deaconess Medical Center Boston Massachusetts USA
7. Massachusetts General Hospital Boston Massachusetts USA
8. University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
9. VA San Diego Healthcare System and University of California San Diego San Diego California USA
10. Columbia University New York USA
11. VA Central Arkansas Healthcare System Little Rock Arkansas USA
12. Wellstar Health System Marietta Georgia USA
13. VA North Texas Health Care System and University of Texas Southwestern Medical Center Dallas Texas USA