1. Division of Cardiology and Cardiovascular Pathophysiology; Teaching Hospital “S.M. della Misericordia,”; Perugia Italy
2. Department of Internal Medicine; Hospital of Assisi; Assisi Italy
3. Division of Cardiology; IRCCS “Arcispedale S. Maria Nuova,”; Reggio Emilia Italy
4. Department of Cardiology; Hospital “Niguarda Ca' Granda,”; Milano Italy
5. Division of Cardiology; “Ospedale Civile,”; Legnano Italy
6. Department of Cardiology; Teaching Hospital “S.M. della Misericordia,”; Perugia Italy