1. Allergy Unit Meyer Children's Hospital IRCCS Florence Italy
2. Department of Health Sciences University of Florence Florence Italy
3. Pediatric Allergy Group, Department of Women and Children's Health, School of Life Course Sciences King's College London London UK
4. Children's Allergy Service, Evelina London Children's Hospital Guy's and St Thomas' NHS Foundation Trust London UK
5. Section of Allergy and Immunology, Department of Pediatrics, Children's Hospital Colorado University of Colorado School of Medicine Aurora Colorado USA