1. Institute of Cardiology; University of Bologna; Policlinico S. Orsola-Malpighi Bologna Italy
2. Cardiovascular Department; Fondazione di Ricerca e Cura “Giovanni Paolo II,” Catholic University of the Sacred Heart; Campobasso Italy
3. Cardiac Electrophysiology and Pacing Unit, Cardiovascular Department; Azienda Ospedaliera Papa Giovanni XXIII; Bergamo Italy
4. Cardiovascular Sciences Department; Catholic University of Sacred Heart; Rome Italy
5. Arrhythmia and Electrophysiology Unit, Division of Cardiology; Santa Maria Della Misericordia Hospital; Rovigo Italy
6. Department of Cardiology; Casa Sollievo della Sofferenza; San Giovanni Rotondo (FG) Italy
7. Department of Cardiology; A.O.U. Policlinico P. Giaccone, University of Palermo; Palermo Italy
8. CRM Division; Boston Scientific Italia; Milan Italy