1. German Cancer Consortium (DKTK), Germany
2. Department of Pediatric Oncology and Hematology, University Children’s Hospital Essen, Germany
3. Institute of Pathology, University Hospital Cologne, Germany
4. Charité University Medicine, Campus Virchow Klinikum, Berlin, Germany
5. Department of Pediatric Oncology and Hematology, Children’s Hospital, University of Cologne, Germany