1. Childhood Cancer Registry of the Rhône-Alpes Region, University of Saint-Etienne, Saint-Etienne, France;
2. Department of Pediatric Hematology and Oncology Unit, University Hospital of Saint-Etienne, Saint-Etienne, France;
3. Host Research Team EA4607 SNA-EPIS, PRES Lyon, Jean Monnet University, University Hospital, Saint-Etienne, France;
4. Department of Public Health and Medical Informatics, University of Saint-Etienne, Saint-Etienne, France