1. Institute of Child Health, London; RCN Institute, Radcliffe Infirmary, Woodstock Road, Oxford
2. Institute of Child Health, London
3. Paediatric Oncology Department, Royal Marsden Hospital, Sutton
4. Department of Paediatric Haematology/Oncology, Llandough Hospital, Penarth, on behalf of FEN-GBR-14 Study Group