1. Electrophysiology, Harvard Medical School , Boston, MA , USA
2. Texas Cardiac Arrhythmia Institute, St. David’s Medical Center , 3000 N. I-35, Suite 720, Austin, TX 78705 , USA
3. Interventional Electrophysiology, Scripps Clinic , 10666 N Torrey Pines Rd, La Jolla, CA 92037 , USA
4. Department of Internal Medicine, Metro Health Medical Center, Case Western Reserve University School of Medicine , 2500 Metrohealth Dr, Cleveland, OH 44109 , USA
5. Department of Biomedicine and Prevention, Division of Cardiology, University of Tor Vergata , Via Montpellier, 1, Rome 00133 , Italy