[1] Univ Padua, Padua, Italy
[2] Clin Montevergine, Mercogliano, Italy
[3] Cntr Cardiol Monzino, Milan, Italy
[4] San Camillo Hosp, Rome, Italy
[5] S Raffaele Hosp, Milan, Italy
[6] Univ Turin, Turin, Italy
[7] Humanitas Gavazzeni, Cardiac Surg, Rozzano, Italy
[8] G Pasquinucci Hosp, Massa, Italy
[9] Univ Bologna, Bologna, Italy
[10] Osped Angelo, Venice, Italy
[11] San Bortolo Hosp, Vicenza, Italy
[12] Univ Pavia, I-27100 Pavia, Italy
[13] Molinette Mauriziano Hosp, Turin, Italy
[14] S Maria della Misericordia Hosp, Udine, Italy
[15] S Croce & Carle Hosp, Cuneo, Italy
[16] Clin S Anna, Catanzaro, Italy
[17] Osped Riuniti Trieste, Trieste, Italy
[18] Univ Parma, I-43100 Parma, Italy
[19] Hesperia Hosp, Modena, Italy
[20] Univ Verona, I-37100 Verona, Italy