1. From the Division of Clinical Pharmacology, Department of Medicine (J.P.V.B., N.R.B., L.A.A., L.X., H.A.I., D.G.H., A.K.), Vanderbilt University Medical Center, Nashville, TN
2. School of Graduate Studies and Research, Meharry Medical College, Nashville, TN (Z.M.)
3. Division of Cardiology, Department of Medicine (A.K.P.), Vanderbilt University Medical Center, Nashville, TN
4. Pharmacology and Toxicology, Faculty of Medicine, American University of Beirut, and Division of Comparative Medicine, Department of Pathology, Microbiology and Immunology (L.E.H.), Vanderbilt University Medical Center, Nashville, TN
5. Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN (D.G.H., A.K.).