1. Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas (P.E.G., W.O., K.V.P., J.A.d.L., A.A.B., T.P.K., S.B., D.J.K.).
2. The Institute of Cardio-Vascular Diseases, Madras Medical Mission, Chennai, India (A.S.M.).
3. Department of Cardiology, Kovai Medical Center and Hospital, Coimbatore, Tamil Nadu, India (T.A.).
4. VA North Texas Health Care System, Dallas (S.B.).