1. Department of Paediatric Surgery; University Hospitals Bristol NHS Foundation Trust; Bristol United Kingdom
2. Departement d'Oncologie de l'Enfant et l'Adolescent Institut Gustave Roussy; Villejuif France
3. Clinical Research Unit; Agence de la biomedecine Institut Gustave Roussy; Villejuif France
4. Department of Pediatric Oncology; Children's Hospital for Wales Heath Park; Cardiff United Kingdom
5. Department of Pediatric Oncology Emma Children's Hospital-Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
6. Department of Pediatric Oncology; Hospital Universitari Vall d'Hebron; Barcelona Spain
7. Hôpital Universitaire des Enfants Reine Av. J. J. Crocq; Bruxelles Belgium
8. Department of Oncology, University College Hospital; London United Kingdom
9. Department of Pediatric Histopathology; Royal Manchester Children's Hospital; Manchester United Kingdom
10. Departments of Pediatrics; Biostatistics, and Radiation Therapy; Institut; Gustave Roussy; Villejuif France
11. TYA South West Cancer Service; Bristol Haematology Oncology Centre; Bristol, United Kingdom
12. Institut d'hématologie et d'Oncologie Pédiatrique; Centre Léon Bérard; Lyon France
13. Chirurgie Pédiatrique Hôpital Bicêtre; Université Paris XI; Orsay France