1. Norfolk & Norwich University Hospital; Department of ENT Surgery; Conley Lane Norwich UK NR4 7UY
2. Cambridge University Hospitals NHS Foundation Trust; Department of ENT Surgery; Hills Road Cambridge Cambridgeshire UK CB2 0QQ
3. University of Manchester, Manchester Academic Health Science Centre; Division of Nursing, Midwifery and Social Work, School of Health Sciences, Faculty of Biology, Medicine and Health; Jean McFarlane Building Oxford Road Manchester UK M13 9PL
4. University of York; Centre for Reviews and Dissemination; York UK YO10 5DD
5. Cambridge University Hospitals NHS Foundation Trust; Hills Road Cambridge UK