1. Haematopoietic Stem Cell Biology Laboratory, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom;
2. Ludwig Institute for Cancer Research and Université Catholique de Louvain, de Duve Institute, Brussels, Belgium;
3. Oxford Biomedical Research Centre/National Health Service Haemato-Molecular Diagnostic Laboratory, John Radcliffe Hospital, Oxford, United Kingdom;
4. Human Genetics Division, School of Medicine, University of Southampton, Southampton, United Kingdom;
5. Department of Haematology, Heatherwood and Wexham Park National Health Service Foundation Trust, Wexham Park Hospital, Slough, United Kingdom;
6. Medical Research Council Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom; and
7. University College London Cancer Institute, University College London, London, United Kingdom