1. Cardiomyopathy Unit, Careggi University Hospital, 50134 Florence, Italy
2. Cardiomyopathy Unit, Careggi University Hospital, 50134 Florence, Italy; Doctoral School of Clinical Medicine, University of Szeged, 6720 Szeged, Hungary
3. Cardiology Unit, IRCCS Meyer Children’s Hospital, 50139 Florence, Italy; Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy