1. Mayo Clinic, Rochester, Minnesota
2. Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
3. Massachusetts General Hospital, Harvard Medical School, Boston
4. Northwestern University Feinberg School of Medicine, Chicago, Illinois
5. Mayo Clinic, Scottsdale, Arizona
6. Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
7. University of Vermont Medical Center, Burlington
8. Washington University, St Louis, Missouri
9. Perelman School of Medicine, University of Pennsylvania, Philadelphia
10. Emory School of Medicine, Emory University, Atlanta, Georgia
11. Cleveland Clinic, Cleveland, Ohio
12. Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania
13. National Heart, Lung, and Blood Institute, Bethesda, Maryland