1. Department of Clinical Sciences Liverpool School of Tropical Medicine Liverpool UK
2. Liverpool Head and Neck CentreAintree University HospitalLiverpool University Hospitals NHS Foundation Trust Liverpool UK
3. Department of Otorhinolaryngology‐Head and Neck Surgery Wirral University Teaching Hospital NHS Foundation Trust Wirral UK
4. Department of Otorhinolaryngology‐Head and Neck Surgery University College London Hospitals NHS Foundation Trust London UK
5. Spire Regency Hospital Macclesfield UK