1. From the Heart Rhythm Institute, University of Oklahoma Health Sciences Center, Oklahoma City, OK (H.N., A.I., W.M.J.); Department of Cardiology, IKEM, Prague, Czech Republic (J.K., P.P., R.C., D.W.); and Department of Cardiology, Texas Arrhythmia Institute at St David’s Medical Center, Austin, TX (A.N., P.S., L.D.B.).