1. From the Division of Clinical Pharmacology, Department of Medicine (C.L.L., F.E., A.P., A.K.), Vanderbilt University School of Medicine, Nashville, TN.
2. Department of Medicine, Division of Nephrology (M.S.), Vanderbilt University School of Medicine, Nashville, TN.
3. Department of Molecular Physiology and Biophysics (A.K.), Vanderbilt University School of Medicine, Nashville, TN.