1. Department of Cardio-Thoracic and Vascular Medicine and Surgery, Division of Cardiology A.O. San Camillo-Forlanini , Circonvallazione Gianicolense, 87, 00152 Rome , Italy
2. Cardiology Department, G. Da Saliceto Hospital , Via Taverna Giuseppe, 49, 29121 Piacenza Italy
3. Department of Medicine and Surgery, University of Parma , Parma , Italy
4. IRCSS Fondazione Don Carlo Gnocchi-ONLUS , via scandicci 269, 50143 Florence , Italy
5. Clinical Cardiology Unit,IRCCS Policlinico San Donato , San Donato Milanese, Milan , Italy
6. Department of Biomedical Science for Health, University of Milan , Milan , Italy