1. From the Jacob Recanati Autonomic Dysfunction Center, Department of Internal Medicine C, Rambam Medical Center, Haifa, Israel (G.J.); the American Heart Association, Dallas, Tex (F.C.); and the Clinical Research Center, Department of Medicine, Pharmacology, and Neurology, Vanderbilt University Medical Center, Nashville, Tenn (S.V., D.R., I.B.).