1. Vanderbilt University School of Medicine, Medical Scientist Training Program, Vanderbilt University (M.J.O.).
2. Division of Clinical Pharmacology, Department of Medicine, Vanderbilt Center for Arrhythmia Research and Therapeutics (VanCART) (Y.W., L.D.H., D.W.M., A.M.G.).
3. Departments of Medicine, Pharmacology, and Biomedical Informatics, Vanderbilt University Medical Center, Vanderbilt Center for Arrhythmia Research and Therapeutics (VanCART), Nashville, TN (D.M.R.).