1. Mayo Clinic, Rochester, Minnesota
2. Duke Clinical Research Institute, Duke University, Durham, North Carolina
3. University of Washington Medical Center, Seattle
4. National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
5. Libin Cardiovascular Institute of Alberta, Calgary, Alberta, Canada
6. University of Missouri, Columbia
7. E. Meshalkin National Medical Research Center of the Ministry of Health of the Russian Federation, Novosibirsk, Russia
8. Intermountain Health Care, Salt Lake City, Utah
9. Herz-und Diabeteszentru, Bad Oeynhausen, Germany
10. Medical Science Center of Moscow State University, Moscow, Russia
11. Bakoulev Center for Cardiovascular Surgery, Moscow, Russia
12. Loyola University Medical Center, Maywood, Illinois
13. Humanitas Rozzano-Milano, Milan, Italy
14. Asklepios Klinik St Georg, Hamburg, Germany
15. Leipzig Heart Center, Leipzig, Germany
16. St Marys Hospital, London, United Kingdom
17. Sidney Kimmel Medical College, Thomas Jefferson University, Wynnewood, Pennsylvania
18. Penn State University, Hershey, Pennsylvania
19. Columbia University, New York, New York