1. Department of Cardiology and Cardiothoracic Surgery, Arrhythmia Unit and Electrophysiology Laboratories, Ospedale San Raffaele, Milan, Italy
2. Department of Cardiac, Thoracic and Vascular Sciences, University of Padova, Via N. Giustiniani 2, 35121 Padova, Italy
3. University Hospital Santa Maria della Misericordia, Udine, Italy
4. Department of Cardiology, Ospedale Civile Ca’Foncello, Treviso, Italy