1. Cochrane ENT; Nuffield Department of Surgical Sciences, University of Oxford; Oxford UK
2. ENT Department; Frimley Health NHS Foundation Trust; Slough UK
3. National Institute for Health and Care Excellence; London UK
4. Department of Otorhinolaryngology - Head & Neck Surgery; University Hospitals Plymouth NHS Trust; Plymouth UK
5. Department of Otolaryngology - Head and Neck Surgery; Samson Assuta Ashdod University Hospital, Ben Gurion University Faculty of Health Sciences; Ashdod Israel
6. Nottingham Children's Hospital; Nottingham UK
7. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht, Utrecht University; Utrecht Netherlands
8. evidENT, Ear Institute; University College London; London UK
9. NIHR UCLH Biomedical Research Centre; University College London; London UK
10. ENT Department; Oxford University Hospitals NHS Foundation Trust; Oxford UK