1. Pediatric Oncology Nantes University Hospital Nantes France
2. Hematology Laboratory Robert‐Debré University Hospital (APHP and Université de Paris) Paris France
3. Nantes Université, INSERM CNRS, Université d'Angers, CRCI2NA Nantes France
4. Department of Molecular Biochemistry CHU Robert Debré, APHP Paris France
5. Pediatric Hematology and Immunology Department Robert‐Debré University Hospital (APHP and Université Paris Cité) Paris France