1. Department of Pediatric Oncology; Emma Children's Hospital/Academic Medical Center; Amsterdam the Netherlands
2. Pediatric Clinical Research Office; Emma Children's Hospital/Academic Medical Center; Amsterdam the Netherlands
3. Department of Pediatric, Adolescent, and Young Adult Oncology; Curie Institute; Paris France
4. Children and Young People's Department; Royal Marsden Hospital; Sutton United Kingdom
5. Department of Biostatistics and Epidemiology; Gustave-Roussy; Villejuif France
6. Department of Pediatric Oncology; Children's Hospital for Wales; Cardiff United Kingdom
7. Pediatric Radiology; Emma Children's Hospital/Academic Medical Center; Amsterdam the Netherlands
8. Department of Radiology; Great Ormond Street Hospital for Children; London United Kingdom
9. Pediatric Oncology; Vall d'Hebron University Hospital; Barcelona Spain
10. Department of Pediatric and Adolescent Medicine; Oslo University Hospital; Oslo Norway
11. Pediatric Hematology Oncology Department; Children's University Hospital; Brussels Belgium
12. Department of Oncology; University College London Hospitals NHS Foundation Trust; London United Kingdom
13. Pathology Department; Royal Manchester Children's Hospital; Manchester United Kingdom
14. Department of Pediatric Oncology; Léon Bérard Center; Lyon France
15. Department of Pediatric Oncology; Bristol Royal Hospital for Children; Bristol United Kingdom
16. Department of Pediatric and Adolescent Oncology; Gustave-Roussy; Villejuif France