1. Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
2. Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Pathology, Berlin, Germany
3. Research Institute, Children's Cancer Center Hamburg, Hamburg, Germany
4. Department of Neurosurgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
5. Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany