1. Ear, Nose and Throat Department, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
2. Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
3. Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, UK
4. Bristol Population Health Science Institute, University of Bristol, Bristol, UK
5. Honorary affiliation with Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
6. Newcastle Clinical Trials Unit, Newcastle University, Newcastle upon Tyne, UK
7. Centre for Academic Primary Care, University of Bristol, Bristol, UK
8. Ear, Nose and Throat Department, Ninewells Hospital, NHS Tayside, Dundee, UK
9. Ear, Nose and Throat Department, Darlington Memorial Hospital, County Durham and Darlington NHS Foundation Trust, Durham, UK
10. Ear, Nose and Throat Department, Manchester Royal Infirmary, Manchester University Foundation NHS Trust, Manchester, UK
11. Ear, Nose and Throat Department, Aintree Hospital, Aintree University Hospitals NHS Foundation Trust, Liverpool, UK
12. Ear, Nose and Throat Department, Aberdeen Royal Infirmary, NHS Grampian, Aberdeen, UK
13. Senate Office, University of Glasgow, Glasgow, UK
14. Ear, Nose and Throat Department, Leeds General Infirmary, Leeds Teaching Hospitals NHS Trust, Leeds, UK