1 KU Leuven Department of Microbiology, Immunology and Transplantation, Laboratory of Allergy and Clinical Immunology Research Group, Leuven, Belgium; University Hospitals Leuven, Department of Otorhinolaryngology, Leuven, Belgium; University Hospital Ghent, Department of Otorhinolaryngology, Laboratory of Upper Airways Research, Ghent, Belgium; Academic Medical Center, University of Amsterdam, Department of Otorhinolaryngology, Amsterdam, The Netherlands.
2 RNENT Hospital, Huntley Street, London, UK.
3 Upper Airways Research Laboratory, Dept of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium; Division of ENT diseases, CLINTEC, Karolinska Institute, University of Stockholm, Sweden;Sun Yat-sen University, International Airway Research Center, First Affiliated Hospital, Guangzhou, China.
4 Dept of Respiratory Medicine and Allergology, Skane Uni- versity Hospital, Lund, Sweden.
5 Personalized Medicine Asthma and Allergy Clinic, Humanitas University and Research Hospital, Milan, Italy, and SANI-Severe Asthma Network Italy.
6 Division of Ear, Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.
7 Ear, Nose, and Throat (ENT) Department, Flinders Univer- sity, Bedford Park, South Australia, Australia.
8 1st Department of ORL, Head and Neck Surgery, Aristotle University, AHEPA Hospital, Thessaloniki, Greece.
9 European Forum for Research and Education in Allergy and Airway Diseases (EUFOREA), Brussels, Belgium.
10 Dept of Respiratory Medicine and Allergology, Institute for Clinical Science, Skane University Hospital, Lund University, Lund, Sweden; Department of Respiratory Medicine, First Faculty of Medicine, Charles University and Thomayer Hospital, Prague, Czech Republic; Dept Clin Pharm and Pharmacol, Univ Groningen, Univ Med Ctr Groningen, Groningen, Netherlands.
11 Immunomodulation and Tolerance Group, Allergy and Clinical Immunology, Inflammation, Repair and Development, National Heart and Lung Institute, Imperial College London; MRC and Asthma UK Centre in Allergic Mechanisms of Asthma, London, United Kingdom.
12 Upper Airways Research Laboratory, Dept of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium.
13 Rhinology and Skull Base, Applied medical research center, University of New South Wales, Sydney, Australia; Faculty of medicine and heath sciences, Macquarie University, Sydney, Australia.
14 Ear, Nose and Throat Department, Guys and St. Thomas Hospital, London, United Kingdom.
15 Department of Otorhinolaryngology Head and Neck surgery, Odense University Hospital, Denmark; University of Southern Denmark, Odense, Denmark.
16 Center for Rhinology and Allergology, Wiesbaden, Germany; Mainz University Allergy Center, Mainz, Germany.
17 Royal National Throat, Nose and Ear Hospital, UCLH, London, UK.
18 Optimum Patient Care, Cambridge, UK; Observational and Pragmatic Research Institute, Singapore.
20 Usher institute, University of Edinburgh, Edinburgh, UK.
21 The David Hide Asthma and Allergy Research Centre, St Mary's Hospital, Newport Isle of Wight, United Kingdom;NIHR Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom; University of Southampton, Southampton, United Kingdom.
22 Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Skane University Hospital, Malmoo, Sweden.
23 Helsinki University Hospital, Helsinki, Finland.
24 Imperial College London, London, UK.
25 Royal Brompton and Ha- refield NHS Trust, London, UK.