1 Section of Cardiac Electrophysiology Cleveland Clinic Cleveland, OH, USA. Electronic address: Pasquale.Santangeli@uphs.upenn.edu.
2 Section of Cardiac Electrophysiology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA. Electronic address: Fermin.Garcia@pennmedicine.upenn.edu.
3 Internacional Arrhythmia Center, Fundación Cardio Infantil-Instituto de Cardiología, Bogotá, Colombia. Electronic address: luchossaenzmorales@yahoo.com.