Liam Masterson1, Martin Vallis2, Ros Quinlivan3, Peter Prinsley4. 1. Ear, Nose, and Throat Department, Cambridge University Hospitals NHS Trust, Cambridge CB2 0QQ, UK lmm398@doctors.org.uk. 2. Rosedale Surgery, NHS Great Yarmouth and Waveney Clinical Commissioning Group, Lowestoft, UK. 3. MRC Centre for Neuromuscular Disease, National Hospital for Neurology and Neurosurgery, London, UK. 4. Ear, Nose, and Throat Department, Norfolk and Norwich University Hospital NHS Trust, Norwich, UK.