1. From the Cardiology Division of the Department of Medicine (J.A.C.L., M.Y.D., H.S., W.P.W., S.G.), the Department of Radiology (J.A.C.L.) of the School of Medicine, and the Department of Epidemiology of the Bloomberg School of Hygiene and Public Health (J.A.C.L., S.L.), Johns Hopkins University, Baltimore, Md.