1. Center for Research and Population Health, Apex, NC (S.A.).
2. Department of Surgery (P.D.S.), University of North Carolina School of Medicine, Chapel Hill.
3. Department of Epidemiology, University of North Carolina at Chapel Hill (P.D.S.).
4. Heart and Vascular Center, Brigham and Women’s Hospital (A.Q., D.L.B.), Harvard Medical School, Boston.
5. Division of Cardiology, Massachusetts General Hospital (D.K.), Harvard Medical School, Boston.
6. Division of Cardiology, University of Texas Southwestern School of Medicine, Dallas (A.P.).
7. Department of Internal Medicine, Campbell University School of Osteopathic Medicine, Lillington, NC (M.B.P., M.B.B.).
8. Division of Cardiology (C.J.R., J.P.V.), University of North Carolina School of Medicine, Chapel Hill.