1. Department of Paediatric Oncology, St Bartholomew's and the Royal London School of Medicine, London,
2. Department of Haematology, Royal Hospital for Sick Children, Glasgow,
3. Department of Haematology, Royal Manchester Children's Hospital,
4. Department of Haematology, The Hospital for Sick Children, Great Ormond Street,
5. Clinical Trial Service Unit, Radcliffe Infirmary, Oxford,
6. Department of Haematology, The Children's Hospital, Birmingham