[1] UCL, Div Surg & Intervent Sci, 43-45 Foley St, London W1W 7TY, England
[2] UCL, Canc Inst, Paul OGorman Bldg,72 Huntley St, London WC1E 6DD, England
[3] Great Ormond St Hosp Sick Children, Dept Paediat ENT Surg, Great Ormond St, London WC1N 3JH, England
[4] Univ Coll London Hosp NHS Fdn Trust, Dept Histopathol, Euston Rd, London NW1 2PG, England
[5] Univ Coll London Hosp NHS Fdn Trust, Head & Neck Ctr, Euston Rd, London NW1 2PG, England
[6] Univ Coll London Hosp NHS Fdn Trust, Royal Natl ENT Hosp, 47-49 Huntley St, London WC1E 6DG, England
[7] UCL, Ear Inst, 332 Grays Inn Rd, London, England
[8] Northwick Pk Hosp & Clin Res Ctr, Dept Otolaryngol Head & Neck Surg, Harrow Rd, London, England