1. Department of Cardiosciences, A.O. San Camillo-Forlanini, Roma, Italy
2. Department of Cardiology, Maggiore Hospital, Bologna, Italy
3. ANMCO Research Center, Florence, Italy
4. Division of Cardiology, Ospedale Cà Foncello, Treviso, Italy
5. Department of Cardiovascular Diseases, S. Giovanni-Addolorata Hospital, Roma, Italy
6. University of Pavia, Pavia, Italy
7. Division of Cardiology, Ospedale Bellaria, Bologna, Italy
8. Division of Cardiology, S. Filippo Neri Hospital, Roma, Italy
9. Division of Cardiology, Augusto Murri Hospital, Fermo, Italy
10. Division of Cardiology, Ospedale A. Manzoni, Lecco, Italy