1. Department of Experimental & Clinical Medicine, University of Florence, Florence, Italy
2. Infectious and Tropical Diseases Unit, Careggi University and Hospital, Florence, Italy
3. Department of Health Science, University of Florence, Florence, Italy
4. Cardiac Rehabilitation Unit, Careggi University Hospital, Florence, Italy
5. Cardiomyopathy Unit, Careggi University Hospital, Florence, Italy
6. Department of Cardiothoracovascular Medicine, Careggi Hospital, Florence, Italy