1. Institute of Cardiology, S.Orsola-Malpighi Hospital; University of Bologna; Bologna Italy
2. Division of Cardiology; Infermi Hospital; Rimini Italy
3. Division of Cardiology; University Hospital; Parma Italy
4. Cardiovascular Department; Ospedali Riuniti; Ancona Italy
5. Division of Cardiology; Arcispedale S. Maria Nuova; Reggio Emilia Italy
6. Division of Cardiology; Macerata Hospital; Macerata Italy
7. Division of Cardiology; Ramazzini Hospital; Carpi Italy
8. Division of Cardiology; S.Anna Hospital; Ferrara Italy
9. Division of Cardiology; Maggiore Hospital; Bologna Italy