1. Pediatric Surgery Pediatric Solid Tumor Unit Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
2. Department of Pediatric Surgical Oncology University Hospital Bicětre Bicětre France
3. Department of Pediatric Surgery University Hospitals Bristol NHS foundation trust Bristol UK
4. Children and Young People's Unit Royal Marsden Hospital Sutton UK
5. Department of Oncology Great Ormond Street Hospital for Children London UK
6. Department of Radiology Great Ormond Street Hospital for Children London UK
7. Institut d’Hématologie et d'Oncologie Pédiatrique Centre Léon Bérard Lyon France
8. SIREDO Oncology Center Institut Curie PSL University Paris France
9. Department of Pediatric Oncology University hospital of Wales Cardiff UK
10. Department of Pathology Central Manchester University Hospitals Manchester United Kingdom
11. Children and Young People's Department Royal Marsden Hospital Sutton United Kingdom
12. Pediatric Oncology Vall d'Hebron University Hospital Barcelona Spain
13. Division of Pediatric and Adolescent Medicine Department of Pediatric Research Oslo University Hospital Oslo Norway
14. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori Milano Italy
15. Clinical Trials and Biostatistics Unit IRCCS Istituto oncologico Veneto Padova Italy
16. Department of Pediatric and Adolescent Oncology Gustave Roussy Villejuif France
17. Hematology and Oncology Division Department of Women’s and Children’s Health Padova University Hospital Padova Italy
18. Pediatric Solid Tumor Unit Princess Maxima Center for pediatric Oncology Utrecht The Netherlands