1. Gustave Roussy, Université Paris‐SaclayDepartment of Children and Adolescent oncology Villejuif France
2. Institut Multisite de PathologieHospices civils de Lyon Bron France
3. Laboratoire d'Anatomie PathologiqueHôpital Necker‐Enfants Malades Paris France
4. Institut d'Hemato‐Oncologie Pediatrique Lyon France
5. Department of Pediatric SurgeryHospices civils de Lyon Bron France
6. Department of Pediatric SurgeryHôpital Necker‐Enfants Malades Paris France
7. SIREDO Oncology Center (CareInnovation and Research for ChildrenAdolescents and young Adults with Cancer) Institut Curie Paris France
8. Service d'Immuno‐Hématologie PédiatriqueCHU de Dijon Dijon France
9. Department of Pediatric OncologyCHU de Toulouse Toulouse France
10. Paris‐Sud University (Paris‐Saclay University)CESPINSERM Villejuif France