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. Cochrane ENT; Nuffield Department of Surgical Sciences, University of Oxford; Oxford UK
4. Guideline Development Team A; NICE; London UK
5. Department of Otolaryngology-Head and Neck Surgery; Samson Assuta Ashdod University Hospital, Ben Gurion University; 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. Department of Operating Rooms; Radboud University Nijmegen Medical Centre; Nijmegen Netherlands
9. evidENT, Ear Institute; University College London; London UK
10. NIHR UCLH Biomedical Research Centre; University College London; London UK