[1] Newcastle Univ, Inst Hlth & Soc, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[2] Newcastle Univ, No Inst Canc Res, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] Univ Manchester, Sch Canc & Enabling Sci, Manchester Canc Res Ctr, Manchester Acad Hlth Sci Ctr, Manchester, Lancs, England
[4] Royal Manchester Childrens Hosp, Dept Paediat Oncol, Manchester M27 1HA, Lancs, England
[5] Univ Leeds, Paediat Epidemiol Grp, Ctr Biostat & Epidemiol, Leeds, W Yorkshire, England
[6] Univ Manchester, Canc Res UK Paediat & Familial Canc Res Grp, Manchester, Lancs, England
[7] Newcastle Univ, Inst Med Genet, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[8] Leeds Teaching Hosp NHS Trust, Paediat & Haematol Dept, Leeds, W Yorkshire, England
[9] Royal Marsden Hosp NHS Trust, Dept Paediat, Inst Canc Res, Sutton, Surrey, England