1. Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart , Rome , Italy
2. Department of Cardiology, S. Maria dei Battuti Hospital , AULSS 2 Veneto, Conegliano (TV) , Italy
3. Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS , L.go A. Gemelli, 1, Rome 00168 , Italy
4. Department of Medicine, University of Parma , Parma , Italy