1. Allergy & Immunology Centre, Pantai Hospital Kuala Lumpur, Jalan Bukit Pantai, Taman Bukit Pantai, Kuala Lumpur 59100, Malaysia
2. Department of Otorhinolaryngology—Head & Neck Surgery, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur 56000, Malaysia
3. Department of Otorhinolaryngology—Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Malaysia
4. Otorhinolaryngology, Gleneagles Hospital Penang, 1, Jalan Pangkor, George Town 10050, Malaysia
5. Otorhinolaryngology, KPJ Klang Specialist Hospital, Persiaran Rajawali, Bandar Baru Klang, Klang 41150, Malaysia
6. Department of Otorhinolaryngology—Head and Neck Surgery, Faculty of Medicine & Health Sciences, University Malaysia Sarawak, Kota Samarahan 94300, Malaysia
7. Allergy & Immunology Clinic, Gleneagles Hospital Kuala Lumpur, Jalan Ampang, Kampung Berembang, Kuala Lumpur 50450, Malaysia
8. Otorhinolaryngology, KPJ Johor Specialist Hospital, 39B Jalan Abdul Samad, Johor Bahru 80100, Malaysia
9. Department of Otorhinolaryngology—Head and Neck Surgery, University Hospital of Münster, 48149 Münster, Germany
10. International Airway Research Center, First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
11. Upper Airways Research Laboratory, Faculty of Medicine, Ghent University, 9000 Ghent, Belgium
12. Department of Clinical Epidemiology and Biostatistics and Medicine, McMaster University, Hamilton, ON L8S 4K1, Canada
13. ARIA & MASK-air, 34090 Montpellier, France
14. Medical Consulting Czarlewski, 92300 Levallois, France
15. Institute of Allergology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, 13353 Berlin, Germany
16. Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology, 12203 Berlin, Germany
17. University Hospital of Montpellier, University of Montpellier, 34000 Montpellier, France
18. Inserm Equipe d’Epidémiologie Respiratoire Intégrative, CESP, 94807 Villejuif, France