1. Pediatric Hematology and Oncology Department Hôpital pour enfant de La Timone AP‐HM Marseille France
2. Pediatric Oncology and Hematology Department University Hospital of Caen (CHU de Caen Normandie) Caen 14000 France
3. Department of Pediatric Hematology Robert Debre Hospital APHP Paris France
4. Pediatric Oncology and Hematology Department University Hospital of Nancy (CHRU Nancy) Nancy France
5. Department of Oncology for Child and Adolescent Gustave Roussy Villejuif France
6. Department of Paediatric Hemato‐oncology University Hospital of Rennes Rennes France