Irfan Syed BSc (Hons) MBBS MRCS DO-HNS PGCertMedEd Specialist Registrar ENT Surgery Great Ormond Street Hospital, London, UK Mohamed Keshtgar BSc MBBS FRCSI FRCS(Gen) PhD, Consultant Surgical Oncologist, Royal Free Hampstead Foundation Trust; Reader in Cancer Surgery, University College London, London, UK