1. Department of Pediatric Oncology; Children's Hospital for Wales; Heath Park Cardiff United Kingdom
2. Departments of Pediatrics (OO), Biostatistics (AR), and Radiation Therapy (CHM); Institut Gustave Roussy; Villejuif France
3. Department of Pediatric Surgery; Trousseau Hospital - APHP - HUEP - Paris VI University; Paris France
4. Department of Pediatric Oncology; Bristol Royal Hospital for Children; Bristol United Kingdom
5. Department of Pediatric Oncology, Emma Children's Hospital - Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
6. Department of Pediatric Histopathology; Royal Manchester Children's Hospital; Manchester United Kingdom
7. Department of Pediatric Oncology; Hospital Universitari Vall d'Hebron; Barcelona Spain
8. Department of Pediatric Surgery; Bicêtre Hospital - APHP - HUPS - Paris XI University; Le kremlin Bicêtre France