1. Admission and Emergency Pediatric Medicine and Surgery Unit, University Hospital Consortium Corporation Polyclinic of Bari, Pediatric Hospital Giovanni XXIII, 70124 Bari, Italy
2. Area of Translational Research in Pediatric Specialities, Allergy Unit, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy
3. Allergic Unit, Department of Pediatric, Meyer Children’s Hospital, 50139 Florence, Italy
4. Allergy Unit, CHU de Montpellier, Université de Montpellier, 34295 Montpellier, France
5. IDESP, UMR A11, Université de Montpellier, 34093 Montpellier, France
6. Department of Pediatrics, San Giovanni di Dio Hospital, 88900 Crotone, Italy
7. Section of Paediatrics, Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
8. Department of Woman, Child and of General and Specialized Surgery, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
9. Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
10. Pediatrics and Neonatology Complex Unit, San Giuseppe Hospital, Azienda USL Toscana Centro, 50053 Empoli, Italy
11. Department of Pediatrics, University Hospital of Pisa, 56124 Pisa, Italy
12. Pediatric Unit, Santa Barbara Hospital, 09016 Iglesias, Italy
13. Pediatric Unit, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, 37126 Verona, Italy