1. Department of Pediatric Oncology; Cambridge University Hospital NHS Trust; Cambridge United Kingdom
2. Department of Paediatrics; National Center for Child Health and Development; Tokyo Japan
3. Non-Hodgkin Lymphoma-Berlin-Frankfurt-Muenster Study Centre, Department of Pediatric Hematology and Oncology; Justus-Liebig-University; Giessen Germany
4. Department of Pediatrics; University Hospital; Padova Italy
5. Department of Bone Marrow Transplantation, Children Oncology and Hematology; Medical University; Wroclaw Poland
6. Department of Pediatric Oncology; Emma Kinderziekenhuis, Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands
7. Department of Pediatric Hematology/Oncology; University Hospital; Leuven Belgium
8. Department of Pediatrics; Göteborg University; Göteborg Sweden
9. Biostatistics and Epidemiology Unit; Institut Gustave-Roussy; Villejuif France
10. Paris-Sud University; Le Kremlin-Bicetre France
11. Department of Pediatric Oncology; Institut Gustave-Roussy; Villejuif France