1. Department of Pediatric Emergency, Pediatric Headache Centre, Regina Margherita Children’s Hospital, A.O.U. Città della Salute e della Scienza di Torino, Piazza Polonia 94, 10126 Turin, Italy
2. Department of Pediatrics, Ospedale degli Infermi, ASL TO3, Via Rivalta 29, 10098 Rivoli, Italy
3. Department of Clinical and Biological Sciences, University of Turin, Regione Gonzole 10, 10043 Orbassano, Italy