1. Harvard Medical School, and Smith Center for Outcomes Research in Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (N.W.W.)
2. Harvard Medical School; Smith Center for Outcomes Research in Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center; and Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (B.J.C., A.K., E.A.S.)
3. Harvard Medical School, and Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (A.S.).