[1] Royal London Hosp, Childrens Canc Grp, CR UK, London E1 1BB, England
[2] Royal Holloway Univ London, Dept Comp Sci, Surrey, England
[3] Inst Child Hlth, London, England
[4] Pembury Hosp, Dept Res Haematol, Pembury, Kent, England
[5] UCL Hosp, London, England