[1] UCL, Div Surg & Intervent Sci, London, England
[2] UCL, UCL Canc Inst, London, England
[3] Barts Hlth NHS Trust, ENT Dept, London, England
[4] UCL, CRUK, London, England
[5] UCL, UCL Canc Trials Ctr, London, England
[6] Univ East Anglia, Norwich Med Sch, Norwich, England
[7] Wrightington Wigan & Leigh NHS Fdn Trust, ENT Dept, Wigan, England
[8] Guys & St Thomas NHS Fdn Trust, Guys Hosp, ENT Dept, Guys & St, London, England
[9] Manchester Univ NHS Fdn Trust, Dept Otolaryngol, Manchester, England
[10] UCL, Ctr Obes Res, London, England
[11] Univ Coll London Hosp NHS Trust, Bariatr Ctr Weight Management & Metab Surg, London, England
[12] UCL, UCL Canc Inst, UCL Div Surg & Intervent Sci, London E1 1BB, England
[13] ENT Dept Barts Hlth NHS Trust, Royal Hosp, London E1 1BB, England