1. Division of Cardiology Cardiac Arrhythmia Service Medical College of Wisconsin Milwaukee Wisconsin USA
2. Division of Cardiology State University of New York Upstate Medical University Syracuse New York USA
3. Department of Cardiovascular Medicine Beaumont Hospital Oakland University William Beaumont School of Medicine Royal Oak Michigan USA
4. 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