[1] Bristol Canc Inst, Med Oncol Dept, Bristol, England
[2] Univ Bristol, Fac Hlth Sci, Bristol Med Sch, Bristol, England
[3] Taunton & Somerset NHS Fdn Trust, Oncol Dept, Musgrove Pk Hosp, Taunton, England
[4] Gloucestershire Hosp NHS Fdn Trust, Oncol Dept, Gloucestershire Oncol Ctr, Cheltenham Gen Hosp, Cheltenham, England
[5] NHS Royal Devon Univ Healthcare, Oncol Dept, Royal Devon & Exeter Hosp Wonford, Exeter, England
[6] Royal United Hosp Bath NHS Fdn trust, Oncol Dept, Bath, England