1. Department of Woman, Child and General and Specialized Surgery, University of Campania ‘Luigi Vanvitelli’, 80138 Naples, Italy
2. Department of Clinical, Surgical, Diagnostic, and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
3. Pediatric Clinic, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
4. Pediatric Unit, Department of Human Pathology in Adult and Developmental Age ‘Gaetano Barresi’, University of Messina, 98122 Messina, Italy
5. Pediatric Unit, IRCCS Azienda Ospedaliera-Universitaria di Bologna, 40138 Bologna, Italy
6. Allergy Unit, Meyer Children’s Hospital, IRCCS, 50139 Florence, Italy