1 Arrhythmology Unit, Cardiology Department, Foligno General Hospital, Via Massimo Arcamone, Foligno, Perugia 06034, Italy; Cardiovascular Disease Department, University of Perugia, Piazza Menghini 1, Perugia 06129, Italy. Electronic address: giuseppe.bagliani@tim.it.
2 Department of Cardiology, School of Medicine, University of Insubria, Viale Borri, 57, Varese 21100, Italy. Electronic address: roberto.deponti@uninsubria.it.
3 Heart and Vessels, University of Florence, viale Morgagni, 85, Florence, Italy. Electronic address: lpadeletti@interfree.it.