1. Department of Cardiovascular & Pulmonary Sciences, Catholic University of the Sacred Heart, 00168 Rome, Italy
2. First Department of Cardiology, National and Kapodistrian University, “Hippokration” Hospital, 11527 Athens, Greece
3. Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
4. Cardiology Unit, Cardiothoracic Department, Azienda Ospedaliera Universitaria Santa Maria della Misericordia, 33100 Udine, Italy