1. Minneapolis Heart Institute and Minneapolis Heart Institute Foundation, Abbott Northwestern Hospital Minneapolis Minnesota
2. Baylor Heart and Vascular Hospital Dallas Texas
3. Henry Ford Hospital Detroit Michigan
4. Cleveland Clinic Cleveland Ohio
5. Medical Center of the Rockies Loveland Colorado
6. Massachusetts General Hospital Boston Massachusetts
7. VA Central Arkansas Healthcare System Little Rock Arkansas
8. Meshalkin Novosibirsk Research Institute Novosibirsk Russia
9. VA San Diego Healthcare System and University of California San Diego La Jolla California
10. The Heart Hospital Baylor Plano Plano Texas
11. Red Cross Hospital of Athens Athens Greece
12. Emory University Hospital Midtown Atlanta Georgia
13. Tristar Centennial Medical Center Nashville Tennessee
14. VA North Texas Health Care System and University of Texas Southwestern Medical Center Dallas Texas