1. Institute of Neuropathology, University Hospital Münster, Münster, Germany
2. Department of Pediatric Hematology and Oncology, University Medical Center Hamburg‐Eppendorf, Hamburg, Germany
3. Institute of Human Genetics, Christian‐Albrechts University Kiel, Kiel, Germany
4. Institute of Human Genetics, University Hospital Schleswig‐Holstein, Kiel, Germany
5. Department of Pediatric Hematology and Oncology, Klinikum Augsburg, Augsburg, Germany
6. Department of Pediatric Hematology and Oncology, University Hospital Münster, Münster, Germany