1. Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena University Hospital, via Giuseppe Campi, 287, Modena, Italy
2. Institute of Internal Medicine and Cardiology, University Hospital of Florence, Florence, Italy
3. Cardiac Electrophysiology, ASST Rhodense, Rho AND Garbagnate Hospitals, Milan, Italy
4. Ordensklinikum Linz Elisabethinen, Linz, Austria
5. Department of Cardiology, Hospital Clinic, University of Barcelona, Spain
6. Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, S.Orsola-Malpighi University Hospital, Bologna, Italy
7. Third Department of Cardiology, Athens University School of Medicine, Athens, Greece
8. Cardiology Department, Garibaldi Nesima Hospital, Catania, Italy
9. Department of Cardiology, Kennemer Gasthuis, Haarlem, The Netherlands
10. Institute of Cardiology, Maggiore Hospital, Crema, Italy
11. Study & Scientific Solutions, Medtronic Core Clinical Solutions, Rome, Italy