1 Department of Medicine, Cardiovascular Division (M.C.Y., E.A.L., S.D.L., J.L.S., J.D.M., E.A.O., J.B.S.), Beth Israel Deaconess Medical Center, Boston, MA.
2 Department of Medicine, Cardiology Division, Tufts University Medical Center, Boston, MA (S.D.L).
3 Division of Cardiovascular Medicine, Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, (J.B.S.), Beth Israel Deaconess Medical Center, Boston, MA.