1. Institute of Neuropathology University Hospital Zurich Zurich Switzerland
2. Institute of Neuropathology University Hospital RWTH Aachen Aachen Germany
3. Department of Diagnostic Imaging University Children's Hospital Zurich Zurich Switzerland
4. Hopp Children's Cancer Center (KiTZ) Heidelberg Germany
5. Division of Pediatric Neurooncology German Cancer Research Center (DKFZ) and German Cancer Consortium (DKTK) Heidelberg Germany
6. Department of Pediatric Hematology and Oncology University Hospital Heidelberg Heidelberg Germany
7. Department of Pediatric Hematology and Oncology Charité University Medicine Berlin Germany
8. Istituto Pediatrico della Svizzera Italiana Bellinzona Switzerland
9. Department of Oncology University Children's Hospital Zurich Zurich Switzerland
10. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands