1. Department of Cardiovascular Diseases; S. Giovanni-Addolorata Hospital; Via Amba Aradam 9 00184 Roma Italy
2. Department of Cardiology; Belluno Hospital; Belluno Italy
3. Department of Epidemiology; Lazio Regional Health Service; Roma Italy
4. Cardiology Unit; Spedali Civili; Brescia Italy
5. IRCCS-Istituto di Ricerche Farmacologiche Mario Negri; Milano Italy
6. SL RM/D; Roma Italy
7. Cardiology Unit, S. Spirito Hospital; Roma Italy
8. A. Alesini Hospital; Roma Italy