1. Nuffield Department of Surgical Sciences, University of Oxford; Cochrane ENT; UK Cochrane Centre, Summertown Pavilion 18 - 24 Middle Way Oxford UK
2. Brighton and Sussex University Hospitals NHS Trust; Department of Otolaryngology; Eastern Road Brighton UK BN2 5BE
3. Menzies School of Health Research, Charles Darwin University; Child Health Division; PO Box 41096 Darwin Northern Territory Australia 0811
4. Perth Children's Hospital; Department of Otolaryngology; Perth Australia
5. The University of Western Australia; School of Paediatrics and Child Health; Perth Australia
6. Cochrane UK; Summertown Pavilion 18 - 24 Middle Way Oxford UK OX2 7LG
7. Faculty of Brain Sciences, University College London; evidENT, Ear Institute; 330 Grays Inn Road London UK WC1X 8DA
8. Telethon Kids Institute, The University of Western Australia; 15 Hospital Avenue Perth Western Australia Australia 6009