1. Department of Human Genetics, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
2. Clinic of Paediatric Haematology and Oncology, Institute of Paediatrics, Poznań, Poland
3. Department of Haematology, University of Cambridge, Addenbrooke's Hospital, Cambridge
4. Cancer Research Unit, University of Newcastle upon Tyne, Newcastle upon Tyne, UK
5. Department of Pathology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
6. Digital Scientific Ltd., Cambridge, UK
7. Department of Child Health, University of Newcastle upon Tyne, Newcastle upon Tyne, UK