1. From the Krannert Institute of Cardiology and the Division of Cardiology (M.M., S.-F.L., S.-K.C., B.J., S.H., T.S., M.J.S., P.-S.C.), Department of Medicine, Indiana University School of Medicine, Indianapolis, IN; and the Cardiovascular Research Laboratory (Y.X., Z.Q., J.N.W.), Departments of Medicine (Cardiology) and Physiology, David Geffen School of Medicine, University of California, Los Angeles, CA.