1 Texas Cardiac Arrhythmia Institute, St David's Medical Center, Austin, Texas, USA.
2 Department of Biomedicine and Prevention, "Tor Vergata" University of Rome, Rome, Italy.
3 Texas Cardiac Arrhythmia Institute, St David's Medical Center, Austin, Texas, USA; Heart Rhythm Management Centre, Brussels, Belgium.
4 Texas Cardiac Arrhythmia Institute, St David's Medical Center, Austin, Texas, USA; Department of Electrophysiology, Albert Einstein College of Medicine, Bronx, New York, USA.
5 Texas Cardiac Arrhythmia Institute, St David's Medical Center, Austin, Texas, USA; Department of Biomedicine and Prevention, "Tor Vergata" University of Rome, Rome, Italy; Interventional Electrophysiology, Scripps Clinic, San Diego, California, USA; Metro Health Medical Center, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA. Electronic address: dr.natale@gmail.com.