Ginger L. Milne, Huiyong Yin, and Jason D. Morrow Division of Clinical Pharmacology, Departments of Medicine and Pharmacology Vanderbilt University School of Medicine, 23 Avenue South at Pierce Avenue, Nashville, TN 37232-6602 Address correspondence to: Jason D. Morrow M.D., Division of Clinical Pharmacology, Departments of Medicine and Pharmacology, Vanderbilt University School of Medicine, 23...