1. Division of Cardiology, Cardio-Thoracic and Vascular Department, Azienda Ospedaliera San Camillo Forlanini , Cir.ne Gianicolense 87, 00152 Rome , Italy
2. Department of Clinical Medicine, Public Health, Life and Environmental Science, University of L'Aquila , L'aquila , Italy
3. Robert M. Berne Cardiovascular Research Center, University of Virginia , Charlottesville, VA , USA
4. Division of Cardiology, Campus Bio-Medico University of Rome , Rome , Italy
5. Division of Cardiology, Azienda Ospedaliera Universitaria Sant’Andrea , Rome , Italy
6. Department of Clinical and Molecular Medicine, Sapienza University of Rome , Rome , Italy
7. Department of Biomedical Science for Health, University of Milan , Milan , Italy