1. From the Autonomic Dysfunction Center (C.C.L., A.D., S.Y.P., D.R.), Division of Pharmacology (D.R.), General Clinical Research Center (P.A.H., D.W.B., D.R.), and Division of General Internal Medicine, Department of Medicine (D.W.B.), Vanderbilt University School of Medicine, Nashville, Tenn; the National Defense Medical Center, Taipei, Taiwan, ROC (C.C.L., C.S.T.); and Franz-Volhard Clinical Research Center, Medical Faculty of the Charite, Humboldt-University, Berlin, Germany (J.J.).