[1] Newcastle Univ, Ctr Canc, Populat Hlth Sci Inst, Newcastle Upon Tyne, England
[2] Univ Liverpool, Liverpool Head & Neck Ctr, Sch Hlth Sci, Liverpool, England
[3] Southmead Hosp North Bristol NHS Hosp Trust, Speech & Language Therapy Res Unit, Bristol, England
[4] Sunderland Royal Hosp, South Tyneside & Sunderland NHS Fdn Trust, Speech & Language Therapy, Sunderland, England
[5] NHS Forth Valley, Stirling, Scotland
[6] Univ Hosp Bristol & Weston NHS Fdn Trust, Head & Neck Study 5000, Bristol, England
[7] Univ Bristol, Bristol, England