1. From Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York (K.P.M.); Department of Cardiology, Vassar Brothers Medical Center, Poughkeepsie, NY (J.J.L.); Department of Cardiology, Montefiore Medical Center, Bronx, NY (U.P.J.); and Department of Cardiology, University of Chicago Medicine, IL (N.U.).