1. Department of Cardiology; “Villa Bianca” Hospital; via Piave 78, 38100 Trento Italy
2. Department of Cardiology; “S. Martino” Hospital; Belluno Italy
3. Department of Cardiology; “Salvatore Maugeri” Foundation, IRCCS, Pavia Medical Center; Italy
4. Department of Cardiology; “S. Camillo” Hospital; Italy
5. Department of Cardiology; INRCA IRCCS; Roma Italy
6. Department of Cardiology; “Riuniti” Hospital; Trieste Italy