1. Cardiology Unit, Department of Emergency and Admission, San Paolo Hospital, Largo Donatori di Sangue 1, 00053 Civitavecchia, Italy
2. Radiodiagnostic Unit, San Paolo Hospital, Largo Donatori di Sangue 1, 00053 Civitavecchia, Italy
3. Division of Cardiology, S. Giovanni Evangelista Hospital, 00019 Tivoli, Italy