Masterson Liam, Vallis Martin, Quinlivan Ros, Prinsley Peter
Ear, Nose, and Throat Department, Cambridge University Hospitals NHS Trust, Cambridge CB2 0QQ, UK
Rosedale Surgery, NHS Great Yarmouth and Waveney Clinical Commissioning Group, Lowestoft, UK.
BMJ. 2015 Sep 16;351:h3725. doi: 10.1136/bmj.h3725.