1. Section of Haemato-Oncology, The Institute of Cancer Research, Surrey, United Kingdom;
2. Medical Oncology Unit, Cancer Research UK, London, United Kingdom;
3. Academic Unit of Paediatric Oncology, University of Manchester, Teenage Cancer Trust Oncology Unit, Christie Hospital National Health Service Trust, Manchester, United Kingdom;
4. University of Tennessee at Chattanooga and T. C. Thompson Children's Hospital, Chattanooga;
5. Dutch Childhood Oncology Group, The Hague, The Netherlands;
6. Centro Ricero Tettamanti, Clinica Pediatrica University di Milano Bicocca, Monza, Italy;
7. Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, United Kingdom;
8. Children's Hospital for Wales, Cardiff, United Kingdom; and
9. Camelia Botnar Laboratories, Great Ormond Street Hospital, London, United Kingdom