1. Palo Alto Medical Foundation; Palo Alto California
2. Sacred Heart Medical Center; Eugene Oregon
3. Appleton Heart Institute; Appleton Wisconsin
4. University of Colorado Health; Ft. Collins Colorado
5. Intermountain Healthcare; Ogden Utah
6. Seattle Heart and Vascular Institute; Seattle Washington
7. Forth Valley Royal Hospital; Edinburgh Scotland
8. Belfast Health and Social Trust; Belfast Ireland
9. Bristol Heart Institute, University Hospitals Bristol; Bristol United Kingdom
10. St. Joseph Medical Center; Bellingham Washington
11. Mid America Heart Institute; Kansas City Missouri