1. Department of Pediatric Oncology and Hematology, University Children's Hospital Essen, University of Duisburg-Essen, Essen, Germany
2. Centre for Medical Genetics, Ghent University Hospital, Ghent, Belgium
3. Genetics and Nuclear Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
4. Center for Neuropathology, Ludwig-Maximilians University, Munich, Germany
5. Department of Pathology, University Hospital, Münster, Germany
6. Department of Pathology, Technical University, Munich, Germany
7. Department of Pathology, Ludwig-Maximilians University, Munich, Germany
8. Cell Biology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
9. Genome Informatics, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
10. Department of Pathology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
11. Division of Gastroenterology and Hepatology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
12. Pediatric Oncology and Hematology, Charité University Medicine, Berlin, Germany
13. Institute of Neuropathology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany
14. Research Institute Childrens Cancer Center, Hamburg, Germany
15. Department of Pediatric Oncology and Hematology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany