1. Cardiology Unit, Cardio-Thoracic-Vascular Building, S.Orsola-Malpighi Polyclinic, University of Bologna, Bologna, Italy
2. Cardiovascular Institute, Ferrara University Hospital, Ferrara, Italy
3. Cardiology Division, IRCCS AOU Di Bologna, Bologna, Italy
4. Cardiology Unit, University of Modena and Reggio Emilia, Modena, Italy