1. Department of Paediatric and Adolescent Oncology; University College London Hospitals NHS Foundation Trust; London UK
2. Cancer Research UK & UCL Cancer Trials Centre; University College London; London UK
3. Cancer Research UK Clinical Trials Unit; School of Cancer Sciences; University of Birmingham; Birmingham UK
4. Department of Cellular Pathology; University College London Hospitals NHS Foundation Trust; London UK
5. Department of Paediatric Oncology and Haematology; Children's Services; John Radcliffe Hospital; Oxford University Hospitals NHS Foundation Trust; Oxford UK