1. Department of Pediatrics, University of Perugia, Località S. Andrea delle Fratte, 06132 Perugia, Italy
2. Department of Pediatrics, University of Chieti, Italy
3. Pediatric Unit, Ospedale Madonna del Soccorso, San Benedetto del Tronto (AP), Italy
4. Department of Child Neurology, II Faculty of Medicine, “La Sapienza” University, Rome, Italy