1. Department of Medical and Molecular Genetics, King’s College London, Faculty of Life Sciences and Medicine, London, United Kingdom;
2. Department of Hematology and Oncology, Charité University Hospital Berlin, Campus Benjamin Franklin, Berlin, Germany;
3. Department of Hematology, Erasmus University Medical Center, Rotterdam, The Netherlands;
4. Department of Haematology, Cardiff University School of Medicine, Cardiff, United Kingdom;
5. Centre for Cancer Research and Cell Biology, Queen’s University Belfast, Belfast, United Kingdom;
6. Department of Haematology, University College London, London, United Kingdom;
7. MLL Munich Leukemia Laboratory, Munich, Germany; and
8. Centre de Recherche en Cancérologie de Marseille, INSERM U1068, Centre National de la Recherche Scientifique UMR7258, Institut Paoli-Calmettes, Aix Marseille University, Marseille, France