1. Department of Pediatric and Adolescent Oncology, Gustave Roussy Cancer Campus Université Paris‐Saclay Villejuif France
2. Pediatric Hematology‐Oncology Department La Timone Hospital, AP‐HM Marseille France
3. Pediatric Onco‐Hematology Department Curie Institute Paris France
4. Pediatric Onco‐Hematology Department Armand Trousseau Hospital, APHP Paris France
5. Pediatric and AYA Oncology Department Centre Oscar Lambret Lille France
6. Pediatric Onco‐Hematology Department University Hospital Center of Nantes Nantes France
7. Pediatric Hematology‐Oncology Department University Hospital Center of Grenoble Grenoble France
8. Pediatric Onco‐Hematology Department University Hospital Center of Bordeaux Bordeaux France
9. Pediatric Hematology‐Oncology Department University Hospital Center of Toulouse Toulouse France
10. Pediatric Hematology‐Oncology Department University Hospital Center of Angers Angers France
11. Department of Pediatric Surgery Sorbonne Université, Armand Trousseau Hospital, APHP Paris France
12. Department of Radiotherapy La Timone Hospital, AP‐HM Marseille France
13. Department of Pathology Armand Trousseau Hospital, APHP Paris France
14. Department of Pathology Hospices Civiles de Lyon Lyon France
15. Department of Statistic Centre Léon Bérard Lyon France
16. Pediatric Onco‐Hematology Department Centre Leon Bérard/IHOPE Lyon France