1. Department of Biostatistics and Health Informatics; Institute of Psychiatry, Psychology and Neuroscience; King's College London; London UK
2. Centre for Implementation Science; Health Services and Population Research Department; Institute of Psychiatry, Psychology and Neuroscience; King's College London; London UK
3. Centre for Primary Care and Public Health; Blizard Institute; Barts and The London School of Medicine and Dentistry; London UK
4. Upper Airway Research Laboratory; Ghent University; Ghent Belgium
5. Department of Otorhinolaryngology; Odense University Hospital; Odense Denmark
6. Skin and Allergy Hospital; Helsinki University Hospital; Helsinki Finland
7. Institute of Social Medicine, Epidemiology and Health Economics; Charité - Universitätsmedizin Berlin; Lodz Germany
8. Institute of Clinical Epidemiology and Biometry; Würzburg University; Würzburg Germany
9. Department of Paediatric Pneumology& Immunology; Charite - Universitaatsmedizin Berlin; Berlin Germany
10. Otorhinolaryngology Department; Academic Medical Centre; Amsterdam The Netherlands
11. Clinical Department of Internal Diseases, Allergology and Clinical Immunology; Medical University of Silesia; Katowice Poland
12. Department of Medical Sciences, Respiratory, Allergy and Sleep Research; Uppsala University; Uppsala Sweden
13. Population Health and Occupational Medicine; National Heart and Lung Institute; Imperial College London; London UK
14. Department of International Health; Johns Hopkins School of Public Health; Baltimore Maryland