Department of Health Sciences, University of Florence, Anna Meyer Children's University Hospital, Florence 50139, Italy. stefano.stagi@yahoo.it. Department of Health Sciences, University of Florence, Anna Meyer Children's University Hospital, Florence 50139, Italy. Frank8622@hotmail.it. Department of Health Sciences, University of Florence, Anna Meyer Children's University Hospital, Florence 50139, Italy. martinabianconi88@gmail.com. Department of Health Sciences, University of Florence, Anna Meyer Children's University Hospital, Florence 50139, Italy. mary.sammarco@hotmail.com. Department of Paediatrics, University of Siena, Siena 53100, Italy; gmunicchi@technet. g.municchi@technet.it. Paediatric Diabetology Unit, Anna Meyer Children's University Hospital, University of Florence, Florence 50139, Italy. s.toni@meyer.it. Paediatric Diabetology Unit, Anna Meyer Children's University Hospital, University of Florence, Florence 50139, Italy. lorenzo.lenzi@meyer.it. Department of Paediatrics, University of L'Aquila, L'Aquila 67100, Italy. alberto.verrottidipianella@univaq.it. Department of Health Sciences, University of Florence, Anna Meyer Children's University Hospital, Florence 50139, Italy. maurizio.demartino@unifi.it.