1. Department of Clinical Sciences and Community Health, Cardiovascular Section, University of Milan , Via Parea, 4 , Milan 20138, Italy
2. Centro Cardiologico Monzino, IRCCS , Via Parea, 4 , Milano 20138, Italy
3. Unità Operativa Cardiologia Riabilitativa, IRCCS Multimedica , Milano , Italy
4. Dipartimento di Scienze Cliniche, Internistiche, Anestesiologiche e Cardiovascolari, ‘Sapienza’, Rome University , Rome , Italy