1. Department of Pediatric Hematology and Oncology University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Research Institute Children's Cancer Center Hamburg Hamburg Germany
3. Department of Pediatric Oncology Dana‐Farber Cancer Institute Boston Massachusetts USA
4. Research Group Anatomy, School of Medicine and Health Studies Carl von Ossietzky University Oldenburg Oldenburg Germany
5. Institute of Neuropathology University Medical Center Hamburg‐Eppendorf Hamburg Germany