1. Division of Cardiology, Cardiac Arrhythmia Service Loma Linda University Health Loma Linda California USA
2. Department of Cardiovascular Medicine, Beaumont Hospital Oakland University William Beaumont School of Medicine Royal Oak Michigan USA
3. Division of Cardiology, State University of New York Upstate Medical Center Syracuse New York
4. Cardiac Arrhythmia Service, Helmsley Electrophysiology Center Icahn School of Medicine at Mount Sinai New York New York USA
5. Cardiac Arrhythmia Service Texas Cardiac Arrhythmia Institute at St. David's Medical Center Austin Texas USA
6. Cardiac Arrhythmia Service Kansas City Heart Rhythm Institute and Research Foundation Kansas City Kansas USA