1. Department of Pediatric Oncology and Hematology University Hospital Frankfurt Frankfurt/Main Germany
2. German Cancer Consortium (DKTK) Heidelberg Germany
3. German Cancer Research Center (DKFZ) Heidelberg Germany
4. Princess Máxima Center for Pediatric Oncology, Research Utrecht The Netherlands
5. Pediatrics 5 (Oncology, Hematology, Immunology), Center for Pediatric, Adolescent and Women's Medicine, Stuttgart Cancer Center Klinikum Stuttgart ‐ Olgahospital Stuttgart Germany
6. Department of Pathology, Section of Pediatric Pathology University Hospital Bonn Bonn Germany
7. Institute of Radiology, Klinikum Stuttgart, Olgahospital, Stuttgart Cancer Center Zentrum für Kinder‐, Jugend‐ und Frauenmedizin Stuttgart Germany
8. Department of Pediatric Surgery and Urology University Children's Hospital Tübingen Germany
9. Institute of Radiotherapy Klinikum Stuttgart Stuttgart Germany
10. Department of Pediatric Oncology University of Zürich Zürich Switzerland
11. Department of Pediatrics St. Anna Kinderspital and St. Anna Kinderkrebsforschung e.V. Vienna Austria
12. Department of Pediatric Oncology University of Wroclaw Wrocław Poland
13. Department of Women's and Children's Health Uppsala University Uppsala Sweden