1. Division of Cardiology, University of North Carolina School of Medicine, Chapel Hill (S.A., G.S., M.C.)
2. Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill (S.A., A.KN, W.R.)
3. Division of Family Medicine, University of North Carolina School of Medicine, Chapel Hill (S.A.).
4. Brigham and Women’s Hospital Heart and Vascular Center and Harvard Medical School, Boston, MA (A.Q., M.V, D.L.B.).
5. Division of Cardiology, University of Texas Southwestern Medical Center, Dallas (A.P.).
6. Social and Health Organizational Research and Evaluation Program, RTI International, Research Triangle Park, NC (D.P.).
7. Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (R.B.).