1. Department of Pediatric and Adolescent Oncology; Institut Gustave Roussy; Villejuif; France
2. Biostatistics Unit; Institut Gustave Roussy; Villejuif; France
3. Department of Pediatrics; Centre Léon Bérard; Lyon; France
4. Onco-Hematology Department; CHU Pellegrin; Bordeaux; France
5. Department of Pediatrics; Institut Curie; Paris; France
6. Onco-Hematology Unit; CHU Purpan; Toulouse; France
7. Aix-Marseille Univ et APHM, Hôpital d'Enfants de La Timone, Service d'Hématologie-Oncologie Pédiatrique; Marseille; France
8. Pediatric Oncology Unit; CHU; Grenoble; France
9. Pediatric Oncology Unit; CHU; Montpellier; France
10. Pediatric Oncology Unit; CHU Nancy; Hopital d'enfants; Vandoeuvre; France