1. Department of Medical and Surgical Sciences, Pediatric Unit, University “Magna Graecia” of Catanzaro, Catanzaro, Italy
2. Department of Pediatrics, University of Messina, Messina, Italy
3. National Centre for Rare Diseases, Istituto Superiore di Sanità, Rome, Italy
4. Section of Pediatrics and Child Neuropsychiatry, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy