[1] Royal Hosp Children, Dept Haematol & Oncol, Bristol, Avon, England
[2] Sheffield Childrens Hosp, Dept Haematol & Oncol, Sheffield, S Yorkshire, England
[3] Great North Childrens Hosp, Childrens Haemopoiet Stem Cell Transplant Unit, Newcastle Upon Tyne, Tyne & Wear, England
[4] Royal Hosp Children, Dept Haematol & Oncol, Glasgow, Lanark, Scotland
[5] Birmingham Childrens Hosp, Dept Haematol & Oncol, Birmingham, W Midlands, England
[6] Royal Marsden Hosp, Dept Haematol & Oncol, Sutton, Surrey, England
[7] Leeds Teaching Hosp, Dept Haematol & Oncol, Leeds, W Yorkshire, England
[8] UCL, Dept Haematol & Oncol, London, England
[9] Royal Manchester Childrens Hosp, Dept Haematol & Oncol, Manchester, Lancs, England
[10] Great Ormond St Hosp Sick Children, Dept Haematol & Oncol, London, England
[11] Imperial Coll, St Marys Hosp, Dept Haematol & Oncol, London, England