1. Cardiovascular Science Department, Fondazione Policlinico Universitario A. Gemelli IRCCS , Largo Gemelli 8, 00168 Rome , Italy
2. CardioThoracic Department, Catholic University Medical School , Rome , Italy
3. Chair and Postgraduate School of Cardiology, University of Pisa , Pisa , Italy
4. Cardiology Division, Pisa University Hospital , Via Paradisa, 2, 56124 Pisa , Italy