1. Hopp-Children's Cancer Center at the NCT Heidelberg (KiTZ), Heidelberg, Germany
2. Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ) and German Cancer Consortium (DKTK), Heidelberg, Germany
3. Department of Pediatric Hematology and Oncology, Heidelberg University Hospital, Heidelberg, Germany
4. Department of Pediatric Oncology, Dana-Farber Cancer Institute and Children's Hospital Cancer Center, Boston, Massachusetts
5. Department of Pathology and Center for Cancer Research, Massachusetts General Hospital, Boston, Massachusetts
6. The Broad Institute of MIT and Harvard, Cambridge, Massachusetts