1. Pediatric Oncology/HematologyCharité – Universitätsmedizin Berlin Berlin Germany
2. Pediatric Oncology/HematologyUniversity Hospital Erlangen Erlangen Germany
3. Department of PediatricsUniversity of Schleswig‐Holstein Kiel Germany
4. Center for DiagnosticsUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
5. Institute of Human GeneticsUniversity of Heidelberg Heidelberg Germany
6. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
7. Research Institute Children's Cancer Center Hamburg Germany
8. Department of Pediatric Hematology and OncologyUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany