1. Perelman School of Medicine, University of Pennsylvania, Philadelphia
2. Duke Clinical Research Institute, Durham, North Carolina
3. Mayo Clinic, Rochester, Minnesota
4. Brigham and Women’s Hospital, Boston, Massachusetts
5. University Hospitals, Case Medical Center, Cleveland, Ohio
6. Emory University, Atlanta, Georgia
7. Washington University School of Medicine, St Louis, Missouri
8. Thomas Jefferson University, Philadelphia, Pennsylvania
9. Tufts University, Boston, Massachusetts
10. Duke University School of Medicine and Duke Heart Center, Durham, North Carolina
11. National Heart, Lung, and Blood Institute, Bethesda, Maryland