1. Cambridge Skull Base Unit, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
2. Department of Otorhinolaryngology, Head and Neck Surgery, Nottingham University Hospitals NHS Trust, Nottingham, United Kingdom
3. NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
4. Emmeline Centre, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
5. Medical Research Council Cognition and Brain Sciences Unit, Cambridge, United Kingdom