1. Nuffield Department of Surgical Sciences, University of Oxford; Cochrane ENT; UK Cochrane Centre, Summertown Pavilion 18 - 24 Middle Way Oxford UK
2. Chulalongkorn University; Department of Otolaryngology, Faculty of Medicine; Bangkok Thailand
3. Brighton and Sussex Medical School; Division of Primary Care and Public Health; Brighton UK BN1 9PH
4. Royal National Throat, Nose & Ear Hospital; Department of Rhinology; Grays Inn Road London UK WC1X 8DA
5. Faculty of Brain Sciences, University College London; evidENT, Ear Institute; 330 Grays Inn Road London UK WC1X 8DA
6. Norwich Medical School, University of East Anglia; Department of Medicine; Norwich UK NR4 7TJ
7. James Paget University Hospital NHS Foundation Trust; ENT Department; Gorleston UK
8. Guy's Hospital; ENT Department; Gerat Maze Pond London UK SE1 9RT