Affiliation: | 1. Pediatrics 5, Klinikum Stuttgart, Olgahospital, Stuttgart, Germany;2. Department of Pediatric Pathology, Kiel Pediatric Tumor Registry, University Hospital of Schleswig‐Holstein, Germany;3. Department of Pediatric Hematology/Oncology and BMT, University of Wroclaw, Wroclaw, Poland;4. Department of Pediatric Oncology, University of Zurich, Zurich, Switzerland;5. St. Anna Kinderspital and St. Anna Kinderkrebsforschung e.V, Vienna, Austria;6. Department of Pediatric Hematology and Oncology, University Children's Hospital Muenster, Münster, Germany;7. Hospital for Children and Adolescents, Goethe‐University Frankfurt, Frankfurt am Main, Germany;8. Department of Pediatric Oncology, University of Tuebingen, Tuebingen, Germany |