1. Department of Otolaryngology, Basildon University Hospital, Basildon, UK
2. Department of Otolaryngology, Head & Neck Surgery, Addenbrooke’s Hospital, Cambridge, Cambridgeshire, UK
3. Department of Otolaryngology, Royal Berkshire Hospital, Reading, UK
4. Department of Otolaryngology, Head and Neck Surgery, Guy’s and St Thomas’ NHS Foundation Trust, London