[1] St Lukes Radiat Oncol Network, Radiat Oncol, Dublin, Ireland
[2] Trinity Coll Dublin, Sch Med, Dublin, Ireland
[3] Univ Oxford, Clin Trials Serv Unit, Nuffield Dept Populat Hlth, Oxford, England
[4] Univ Manchester, Fac Biol Med & Hlth, Div Canc Sci, Manchester Canc Res Ctr, Manchester, Lancs, England
[5] St James Hosp, Trinity St Jamess Canc Inst, Dublin, Ireland
[6] Guys & St Thomas NHS Fdn Trust, Dept Phys, London, England