1. Allergy Unit, Department of Pediatrics Meyer Children's University Hospital Florence Italy
2. Pediatric Allergy Group, Department of Women and Children's Health, School of Life Course Sciences King's College London London UK
3. Department of Allergy and Immunology Centre Hospitalier Universitaire Sainte‐Justine and Centre Hospitalier de l'Université de Montréal Montreal Quebec Canada
4. Pediatric Allergy Unit University Hospitals of Geneva and University of Geneva Geneva Switzerland
5. Children's Allergy Service, Evelina London Children's Hospital Guy's and St Thomas' NHS Foundation Trust London UK