1. Cardiomyopathy Unit, Careggi University Hospital, Florence, Italy (A.D.F., E.D.P., C.B., G.B.).
2. Doctoral School of Clinical Medicine, University of Szeged, Hungary (E.D.P.).
3. Cardiology Unit, IRCCS Meyer Children’s Hospital, Florence, Italy (M.Z., A.M., I.O.).
4. Department of Experimental and Clinical Medicine, University of Florence, Italy (I.O.).