1 Department of Otorhinolaryngology and Head & Neck Surgery, St Mary’s Hospital, Imperial College Healthcare NHS Trust, London, UK
2 Department of Otorhinolaryngology and Head & Neck Surgery, Manchester Roya lInfirmary, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK
3 Department of Otorhinolaryngology and Head & Neck Surgery, Queen’s Hospital, Barking, Havering and Redbridge University Hospitals NHS Trust, Essex, UK