[1] Christie NHS Fdn Trust, Clin Oncol, Manchester, Lancs, England
[2] Univ Manchester, Div Canc Sci, Manchester, Lancs, England
[3] Christie NHS Fdn Trust, Proton Clin Outcomes Unit, Manchester, Lancs, England
[4] Univ Manchester, Ctr Paediat Teenage & Young Adult Canc, Manchester, Lancs, England
[5] Royal Manchester Childrens Hosp, Paediat Oncol, Manchester, Lancs, England