1. Pediatric Unit, Department of Clinical, Surgical, Diagnostic and Pediatric Sciences University of Pavia Pavia Italy
2. Pediatric Clinic, Fondazione IRCCS Policlinico San Matteo Pavia Italy
3. Institute of Translational Pharmacology, National Research Council Palermo Italy
4. Division of Allergy, Department of Pneumology, Allergology and Oncology University Hospital of Montpellier Montpellier France
5. Institut Desbrest d'Epidémiologie et de Santé Publique, UMR UA‐11, University of Montpellier–INSERM Montpellier France
6. WHO Collaborating Centre on Scientific Classification Support Montpellier France