1. Pediatric Hematology and Oncology, University of Freiburg, Freiburg, Germany;
2. Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany;
3. Pediatrics, Aarhus University Hospital Skejby, Aarhus, Denmark;
4. Department of Pediatrics, University Hospital Jena, Jena, Germany;
5. Pediatric Hematology, Oncology and Hemostaseology, University of Frankfurt, Frankfurt, Germany;
6. Institute of Cell and Molecular Pathology, Hannover Medical School, Hannover, Germany;
7. Department of Pathology, Clinical Centre South West, Böblingen Clinics, Böblingen, Germany;
8. Pediatric Hematology and Oncology, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic;
9. Pediatric Hematology-Oncology, Istituto di Ricovero e Cura a Carattere Scientifico Ospedale Bambino Gesù, Rome, University of Pavia, Pavia, Italy;
10. Pediatric Hematology and Oncology, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo, Pavia, Italy;
11. Hematology and Oncology, University Children's Hospital, Zurich, Switzerland;
12. St Anna Children's Hospital, Department of Pediatrics, Medical University Vienna, Vienna, Austria;
13. Department of Pediatric Oncology/Hematology, Erasmus MC, Rotterdam, The Netherlands;
14. Dutch Childhood Oncology Group, The Hague, The Netherlands;
15. Department of Pediatric Hematology-Oncology, Ghent University Hospital, Ghent, Belgium; and
16. Cancer Genomics Project, Graduate School of Medicine, University of Tokyo, Tokyo, Japan