1. Children's and Young Persons Cancer Services, University College London Hospital Trusts, London, United Kingdom;
2. Department of Paediatric Oncology, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals trust, Newcastle upon Tyne, United Kingdom;
3. Department of Pediatric Oncology, Dana-Farber Cancer Institute and Boston Children's Hospital, Boston, Massachusetts, USA;
4. Children's Oncology Group, Monrovia, California, USA;
5. Department of Pediatric Oncology, Children's Healthcare of Atlanta, Emory University, Atlanta, Georgia, USA;
6. Department of Paediatric Oncology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom;
7. Department of Pathology, University of Cambridge, Cambridge, United Kingdom;
8. University of Texas Southwestern Medical Center and Children's Medical Center, Dallas, Texas, USA;
9. Department of Pathology, Royal Victoria Hospital, Belfast Health Trust, Belfast, United Kingdom;
10. Department of Pediatric Surgery, Birmingham Children's Hospital NHS Foundation Trust, Birmingham, United Kingdom;
11. Riley Hospital for Children, Indianapolis, Indiana, USA;
12. Department of Medical Oncology, St. James's Institute of Oncology, St. James University Hospital, Leeds, United Kingdom;
13. Department of Gynecology Oncology, University of Toronto, Sunnybrook Health Sciences Center, Ontario, Canada;
14. Department of Gynecologic Oncology, North Shore University Health System, Evanston, Illinois, USA;
15. Medical Research Council Clinical Trials Unit, London, United Kingdom