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