1. Division of Cardiology, Department of Medicine (C.P.M., J.L.J., J.H.W.), Massachusetts General Hospital, Boston.
2. Department of Medicine (D.S.O., S.R., M.J.-O., S.M.), Massachusetts General Hospital, Boston.
3. Division of Cardiology, Department of Medicine, Cleveland Clinic, OH (J.A.C.).
4. Department of Medicine, Yale-New Haven Hospital, CT (A.S.).
5. Brigham and Women’s Hospital Heart & Vascular Center, Harvard Medical School, Boston, MA (M.V.).