[1] Great Ormond St Hosp Children NHS Fdn Trust, Cochlear Implant Programme, Great Ormond St, London WC1N 3JH, England
[2] Great Ormond St Hosp Children NHS Fdn Trust, Paediat Oncol, Great Ormond St, London WC1N 3JH, England
[3] Univ Coll London UCL, Ear Inst, 332 Grays Inn Rd, London WC1X 8EE, England
[4] Patient & Publ Involvement NHS Res Parent, London, England