1. Department of Otorhinolaryngology University Hospitals Leuven KU Leuven Leuven Belgium
2. Allergy and Clinical Immunology Research Group Department of Microbiology Immunology and Transplantation KU Leuven Leuven Belgium
3. EUFOREA European Forum for Research and Education in Allergy and Airway Diseases Brussels Belgium
4. Department of Respiratory Disease University Hospital Arnaud de Villeneuve Montpellier France
5. Department of Otorhinolaryngology Academic Medical Center Amsterdam The Netherlands