1. AYA Unit Department of Hematology Fertility Preservation Hôpital Saint Louis Paris France
2. Sorbonne University Paris France
3. Department of Pediatric Oncology Gustave Roussy Institute Villejuif France
4. Department of Pediatric Hemato‐Immunology Hospital Robert Debré Paris France
5. Department of Reproductive Biology Hospital Tenon Paris France
6. Department of Reproductive Biology Hospital Delafontaine St Denis France
7. Department of Pediatric Surgery Hospital Bicêtre Le Kremlin‐Bicêtre France
8. Department of Pediatric Oncology Institut Curie Paris France
9. Department of Pediatric Hematology Center Hospitalier Intercommunal de Créteil Créteil France
10. Department of Pediatric Hemato‐Immunology Hospital Necker Paris France
11. Paris‐Descartes University Paris France
12. Department of Pediatric Surgery Hospital Robert Debré Paris France
13. Department of Reproductive Biology Hospital Cochin Paris France
14. Paris‐Sud University Le Kremlin Bicêtre France
15. Department of Pediatric Surgery Hospital Necker Paris France
16. Paris‐Diderot University Paris France