1. Electrophysiology Unit, Department of Internal Medicine, San Giuseppe Hospital, Italy
2. Cardiovascular and Neurological Department, San Donato Hospital, Arezzo, Italy
3. Invasive Cardiology Unit, S. Maria Annunziata Hospital, Florence, Italy
4. Cardiology, Versilia Hospital, Lido Di Camaiore, Italy
5. Cardiology, Ospedali Riuniti, Livorno, Italy
6. Cardiology, San Luca Hospital, Lucca, Italy
7. Cardiology, Apuane Hospital, Massa Carrara, Italy
8. Arrhythmology Unit, Department of Invasive Cardiology Fondazione “Gabriele Monasterio” CNR, Pisa, Italy
9. Second Division of Cardiology, Cardiac-Thoracic-Vascular Department, New Santa Chiara University Hospital, Pisa, Italy
10. Cardiology, Santo Stefano Hospital, Prato, Italy
11. Department of Cardiology, University Hospital, Siena, Italy
12. Department of Cardiology, Valdichiana Hospital, Montepulciano, Italy
13. Cardiology and Electrophysiology Unit, S. Maria Nuova Hospital, Florence, Italy