1. Adolescent and Pediatric Oncology Department; Institut Curie; Paris France
2. Department of Biostatistics; Institut Curie; Paris France
3. Paediatric Oncology; Hospital Universitari Vall d'Hebron; Barcelona Spain
4. Pathology Department; Royal Manchester Children's Hospital; Manchester United Kingdom
5. Pediatric Haematology Oncology Department; Hopital Universitaire des enfants; Brussels Belgium
6. Department of Paediatric Oncology; Royal Manchester Children's Hospital; Manchester United Kingdom
7. Center of Pediatric Oncology; Princess Máxima; Utrecht The Netherlands
8. Department of Pediatric Oncology; Institut d'Hematologie et d'Oncologie Pédiatrique; Lyon France
9. Department of Pediatric Oncology; Emma Children's Hospital - Academic Medical Center; University of Amsterdam, Amsterdam The Netherlands
10. Department of Paediatrics; Rigshospitalet; Copenhagen Denmark
11. Department of Pediatric Oncology; Children's Hospital for Wales; Heath Park, Cardiff United Kingdom
12. Pediatric Oncology Unit; Gustave-Roussy; Villejuif France
13. School of Clinical Sciences; University of Bristol; Bristol United Kingdom