1. Leukaemia Research Cytogenetics Group, Translational and Clinical Research Institute Newcastle University Newcastle upon Tyne UK
2. Department of Clinical Genetics Children's Cancer Research Institute Vienna Austria
3. Northern Genetics Service The Newcastle‐upon‐Tyne Hospitals NHS Foundation Trust, Institute of Genetic Medicine, International Centre for Life Newcastle upon Tyne UK
4. Haematology and Oncology Department Great Ormond Street Hospital London UK
5. Paediatric Haematology Department Bristol Royal Hospital for Children Bristol UK
6. Department of Haematology UCL Cancer Institute London UK