1. Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Hospital of Geneva, Geneva, Switzerland
2. Department of Pediatrics, CANSEARCH Research Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland
3. Department of Pediatric Oncology, National Cancer Institute, Cairo University, Cairo, Egypt
4. Division of Pediatric Neurooncology, German Consortium for Translational Cancer Research (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
5. Department of Pediatric Oncology, Hematology, and Immunology, Heidelberg University Hospital, Heidelberg, Germany
6. Institute of Neuropathology, University of Bonn Medical Center, Bonn, Germany
7. Reference Center for Neuroradiology, University Hospital of Wuerzburg, Wuerzburg, Germany
8. Division of Pediatric Hematology and Oncology, University Medical Center Goettingen, Goettingen, Germany