1. Vanderbilt Center for Arrhythmia Research and Therapeutics, Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN (M.J.W., D.O.K., K.K., S.S.P., D.J.B., B.C.K.).
2. University Grenoble Alpes, Inserm, U1216, Grenoble Institut Neurosciences, Grenoble, France (I.M.).
3. Division of Cardiology, Children’s Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania (V.R.I.).