1. Cardiology and Arrhythmology Clinic, Marche Polytechnic University, University Hospital “Umberto I – Lancisi - Salesi”, Via Conca 71, Ancona 60126, Italy
2. Cardiology Unit, “Card. G. Panico” Hospital, Via San Pio X, Tricase 73039, Italy
3. Division of Cardiology, University of Eastern Piedmont, “Maggiore della Carità” Hospital, Viale Piazza D'Armi 1, Novara 28100, Italy
4. Institute of Cardiology, University of Bologna, S. Orsola-Malpighi University Hospital, Via Albertoni 15, Bologna 40138, Italy
5. Division of Cardiology, Monaldi Hospital, Second University of Naples, Via Leonardo Bianchi 1, Naples 80131, Italy
6. Cardiology Department, University of Modena and Reggio Emilia, Policlinico di Modena, Largo del Pozzo 71, Modena 41125, Italy