1. IRCCS, Istituto Auxologico Italiano, Department of Cardiology, Cardiac Rehabilitation Unit, S. Luca Hospital , Piazzale Brescia 20, 20149 Milan , Italy
2. Postgraduate School in Sport Medicine and Physical Exercise, University Milano-Bicocca , Milan , Italy
3. Postgraduate School in Sport Medicine, University of Milano , Milan , Italy
4. Department of Medicine and Surgery, University Milano-Bicocca , Milan , Italy