1. From the Division of Cardiology, the Department of Medicine (B.B., N.C., F.Y., A.R., L.D.O., K.W.G., X.W., L.W.C., A.J.L., and J.A.A.), David Geffen School of Medicine at University of California at Los Angeles, Los Angeles, Calif; and the Department of Human Genetics (K.R.), University of California at Los Angeles, Los Angeles, Calif.