1. Leukaemia Research Cytogenetics Group, Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, United Kingdom;
2. Clinical Trial Service Unit, University of Oxford, Oxford, United Kingdom;
3. Bristol Genetics Laboratory, North Bristol National Health Service Trust, Bristol, United Kingdom;
4. Leeds Institute of Molecular Medicine, University of Leeds, Leeds, United Kingdom;
5. Department of Paediatric Haematology and Oncology, Leeds General Infirmary, Leeds, United Kingdom;
6. Department of Paediatric Oncology, John Radcliffe Hospital, Oxford, United Kingdom;
7. Department of Haematology, Great Ormond Street Hospital, London, United Kingdom; and
8. Department of Haematology, Sheffield Children’s Hospital, Sheffield, United Kingdom