1. Depatment of Haematology, Great Ormond Street Hospital for Children London UK
2. Cancer Section, Institute of Child Health, University College London UK
3. Bristol Genetics Laboratory, Southmead Hospital, North Bristol NHS Trust UK
4. UCL Genomics, Institute of Child Health, University College London UK
5. Department of Hematology University Hospital Schleswig‐Holstein Kiel Germany
6. School of Social and Community Medicine, University of Bristol UK
7. Department of Paediatric Haematology/Oncology, Royal Hospital for Children Bristol UK
8. Centre for Molecular Pathology, The Royal Marsden Sutton UK
9. Trapehade, Monferran‐Plavès France