1 Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", University of Messina, Messina, Italy.
2 Department of Public Health and Paediatric Sciences, University of Turin-Regina Margherita Children Hospital-Azienda Ospedaliero-Universitaria (A.O.U.) Città della Salute e della Scienza di Torino, Turin, Italy.
3 Division of Pediatric Endocrinology, Hospital Sant Joan de Déu, Barcelona, Spain.
4 Metabolic Disorders and Diabetes Unit, "Giovanni XXIII" Children's Hospital, Azienda Ospedaliero-Universitaria (AOU) Policlinico-Giovanni XXIII, Bari, Italy.