1. Department of Pediatrics, Aldo Moro University of Bari, Bari, Italy
2. Allergy Unit, Department of Pediatrics, Anna Meyer Children’s University Hospital, Florence, Italy
3. Allergy Unit, Département de Pneumologie et Addictologie, Hôpital Arnaud de Villeneuve, CHU de Montpellier, Univ Montpellier, Montpellier, France
4. Department of Pediatrics, University of Pavia, Pavia, Italy
5. Epidemiology of Allergic and Respiratory Diseases Department (EPAR), IPLESP, UMR 1136 INSERM - Sorbonne Université, Paris, France