1. Allergology Section, Paediatrics Unit Pisa University Hospital Pisa Italy
2. Department of Clinical and Experimental Medicine University of Pisa Pisa Italy
3. Paediatric Asthma and Cough Centre, Istituti Ospedalieri Bergamaschi Gruppo Ospedaliero San Donato Bergamo Italy
4. Nursing School Vita‐Salute San Raffaele University Milan Italy
5. Paediatrics and Neonatology Division, Women's and Children's Health Department Versilia Hospital Lido di Camaiore Italy