1. Section of Allergy and Clinical ImmunologyImperial College LondonNational Heart and Lung InstituteRoyal Brompton HospitalLondonUK
2. Allergy SectionHospital Infantil Universitario Niño JesúsMadridSpain
3. Allergy DepartmentComplejo Hospitalario Universitario de SantiagoSantiago de CompostelaSpain
4. Allergology DepartmentCentre de l'Asthme et des Allergies. Hôpital d'Enfants Armand‐Trousseau (APHP)‐Sorbonne Universités, UPMC Univ Paris 06UMR_S 1136Institut Pierre Louis d'Epidémiologie et de Santé PubliqueEquipe EPARF‐75013 75571ParisCedex 12France
5. Center for Rhinology and AllergologyDepartment of OtorhinolaryngologyHead and Neck SurgeryUniversity Hospital MannheimWiesbadenGermany
6. Research Centre for Prevention and Healththe Capital Region of DenmarkGlostrupDenmark
7. Department of Clinical Experimental ResearchGlostrup University HospitalGlostrupDenmark
8. Department of Clinical MedicineFaculty of Health and Medical SciencesUniversity of CopenhagenCopenhagenDenmark
9. Département de Pneumologie et AddictologieHôpital Arnaud de VilleneuveUniversity Hospital of Montpellier, Sorbonne Universités, UPMC Paris 06, UMR‐S 1136, IPLESPEquipe EPAR75013ParisFrance