1 Texas Cardiac Arrhythmia Institute, St. David's Medical Center, 3000 North IH-35, Suite 720, Austin, TX 78705, USA. Electronic address: domenicodellarocca@hotmail.it.
2 Department of Cardiology, Azienda Ospedaliera-, Universitaria "Luigi Sacco", Via G.B Grassi, 74, 20157 Milan, Italy. Electronic address: forleo@me.com.
3 Texas Cardiac Arrhythmia Institute, Center for Atrial Fibrillation at St. David's Medical Center, 1015 E. 32nd Street, Suite 516, Austin ,TX 78705, USA. Electronic address: dr.natale@gmail.com.