1. Department of Cardiology, Fondazione IRCCS Policlinico San Matteo; Pavia Italy
2. Service of Biometry and Clinical Epidemiology, Fondazione IRCCS Policlinico San Matteo; Pavia Italy
3. University of Torino, San G. Battista Hospital; Torino Italy
4. University of Insubria, Circolo Hospital and Macchi Foundation; Varese Italy
5. University of Insubria, Clinical Institute Mater Domini; Castellanza (VA) Italy
6. F. Ferrari Hospital, Casarano (LE); Italy
7. University of Piemonte Orientale, Maggiore Hospital; Novara Italy
8. Sacro Cuore Hospital, Negrar (VR); Italy
9. University of Brescia, Spedali Civili Hospital; Brescia Italy
10. IRCCS S. Maugeri Foundation, Scientific Institute, Tradate (VA); Italy
11. Guidant Italia; Milano Italy