1. From the Division of Cardiology, Department of Medicine (M.V., M.-H.L, T.O., A.C.L., H.S.K., P.-S.C.), Cedars-Sinai Medical Center, and the Department of Pathology and Anatomy (M.C.F.), UCLA School of Medicine, Los Angeles, Calif, and the Department of Physics and Astronomy (S.-F.L.), Vanderbilt University, Nashville, Tenn.