1. Department of Pediatric Hematology and Oncology, Erasmus MC - Sophia Children's Hospital, Rotterdam, Netherlands
2. Department of Pediatric Hematology and Oncology, Saarland University, Saarbrucken, Germany
3. Department of Hematology and Pediatric Onco-Hematology, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
4. Department of Statistics, The Netherlands Cancer Institute, Amsterdam, Netherlands
5. Emma Kinderziekenhuis/Academic Medical Center, Amsterdam, Netherlands
6. Department of Pathology, Cardiff University School of Medicine, Cardiff, United Kingdom
7. University of Kiel, Institute of Pediatric Pathology, Kiel, Germany
8. Department of Pathology, Hopitaux Universitaires Est Parisien, Paris, France
9. Department of Emergency Medicine, Medical University of Wroclaw, and Department of Pediatric Surgery, Marciniak Hospital, Wroclaw, Poland
10. Department of Pediatric Oncology and INSERM U830, Institut Curie, Paris, France
11. Department of Pediatric and Adolescent Oncology, University College Hospital, London, United Kingdom
12. Department of Pediatrics, Centre Leon Berard, Lyon, France
13. Molecular Hematology and Cancer Biology, Institute of Child Health, London, United Kingdom