1. Pediatric Adolescent and Young Adult Department; Institut Curie; Paris France
2. European Hospital Georges Pompidou; Pathology Department; Paris Descartes University; Paris France
3. Pediatric Oncology Department; Centre Oscar Lambret; Lille France
4. Pediatric Department; Hopital Sud, Centre Hospitalier Universitaire; Rennes France
5. Pediatric Oncology Unit; Institut Gustave Roussy; Villejuif France
6. Pediatric Department; Institut d'hematologie et d'Oncologie Pediatrique; Lyon France
7. Biostatistical Department; Institut Curie; Paris France