1. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
2. Department of Radiology and Nuclear Medicine University Medical Center Utrecht/Wilhelmina Children's Hospital, Utrecht University Utrecht The Netherlands
3. Sorbonne Université/Assistance Publique Hôpitaux de Paris‐Hôpital Armand Trousseau Paris France
4. Department of Pediatric Oncology and Hematology Saarland University Medical Center and Saarland University Faculty of Medicine Homburg Germany
5. Netherlands Cancer Institute Amsterdam The Netherlands
6. UCL Great Ormond Street Institute of Child Health University College London London UK
7. Department of Pathology University Medical Center Utrecht Utrecht The Netherlands
8. Department of Pathology Sidra Medicine Doha Qatar
9. Clinic of Diagnostic and Interventional Radiology, Division of Pediatric Radiology Heidelberg University Hospital Heidelberg Germany
10. Department of Paediatric Oncology Hospital Universitario Virgen del Rocío Seville Spain
11. Department of Paediatric Oncology Royal Hospital for Children Glasgow Scotland
12. Department of Histopathology Great Ormond Street Hospital for Children NHS Foundation Trust London UK
13. Theodor‐Boveri‐Institute/Biocenter University of Wuerzburg Wuerzburg Germany
14. Department of Paediatric Surgery Marciniak Hospital Wroclaw Poland
15. Department of Paediatric Traumatology and Emergency Medicine Marciniak Hospital Wroclaw Poland
16. Department of Radiation Oncology Saarland University Medical Center and Saarland University Faculty of Medicine Homburg Germany
17. Department of Pathology Fondazione IRCCS Istituto Nazionale dei Tumori Milano Italy
18. Department of Pediatric Oncology Hôpital d'Enfants de la Timone Marseille France
19. Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden
20. Section of Pediatric Pathology University Hospital Bonn Bonn Germany
21. Laboratory of Pathology East Netherlands (LABPON) Hengelo The Netherlands
22. Research Program Instituto Nacional de Cancer Rio de Janeiro Brazil
23. Childhood Cancer Research Unit Astrid Lindgren's Children's Hospital, Karolinska Institutet Stockholm Sweden
24. Department of Pediatric Hematology and Oncology St. Annastift Children's Hospital Ludwigshafen Germany