1. Cochrane UK; Oxford UK
2. Division of Oral Health Sciences; Dundee Dental School, University of Dundee; Dundee UK
3. Heath Services Research Unit; University of Aberdeen; Aberdeen UK
4. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; The University of Manchester; Manchester UK
5. Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health; The University of Manchester; Manchester UK
6. evidENT, Ear Institute; University College London; London UK
7. National Institute of Health Research; University College London Hospitals Biomedical Research Centre; London UK
8. Cochrane ENT; Nuffield Department of Surgical Sciences, University of Oxford; Oxford UK
9. Cochrane Oral Health; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Manchester UK