1. Department of Cardiovascular, Endocrine-Metabolic Diseases and Aging, Italian National Institute of Health, Rome, Italy
2. Centro Cardio-Aritmologico, Rome, Italy
3. Padre Antero Micone Hospital, ASL 3 “Genovese”, Genova, Italy
4. Cardiology Department, Ospedale Maggiore Di Crema, Crema, Italy
5. Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena, Modena, Italy