1. Division of Cardiology, Hospital of the University of Pennsylvania, Philadelphia
2. Penn Cardiovascular Outcomes, Quality, and Evaluative Research Center, University of Pennsylvania, Philadelphia
3. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
4. Corporal Michael J. Crescenz VA Medical Center, Philadelphia, Pennsylvania
5. Division of Cardiac Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia
6. Inova Heart and Vascular Institute, Fairfax, Virginia
7. Icahn School of Medicine at Mount Sinai, New York, New York
8. Mayo Clinic, Rochester, Minnesota
9. Division of General Internal Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia