1. Unit of Clinical Pediatrics, Department of Medical and Pediatric Sciences, University of Catania, Via Santa Sofia, 95123 Catania, Italy
2. Unit of Child Neuropsychiatry, Department of Medical and Pediatric Sciences, University of Catania, Catania, Italy
3. Unit of Pediatrics and Pediatric Emergency, Azienda Ospedaliera-Universitaria O.V.E. Policlinico, University of Catania, Catania, Italy