1. Cardiology Section, F. Perinei Hospital, Altamura, Bari, Italy
2. Cardiology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy.
3. Ospedale Generale Regionale "F. Miulli", Acquaviva delle Fonti, Bari,
Italy
4. Cardiac Surgery Section, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
5. Cardiology Section, S. Paolo Hospital, Bari, Italy