1. From the Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA (A.R.O., F.R., V.P., A.V., P.R.F.); Department of Cardiology, Boston Children’s Hospital, Boston, MA (A.R.O., M.C., L.M.); Department of Medicine, Brigham and Women’s Hospital, Boston, MA (A.R.O., J.O.); and Divisions of Cardiology and Clinical Epidemiology, Jewish General Hospital, Montreal, QC, Canada (J.A.).