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