1. Pediatrics 5 (Oncology, Hematology, Immunology)Klinikum StuttgartOlgahospital Stuttgart Germany
2. Kiel Paediatric Tumor RegistryDepartment of Paediatric PathologyUniversity Hospital of Schleswig‐Holstein Kiel Germany
3. Department of Radiation OncologyKlinikum StuttgartOlgahospital Stuttgart Germany
4. Pediatric RadiologyRadiologisches InstitutKlinikum StuttgartKatharinenhospital Stuttgart Germany
5. Pediatric SurgeryKlinikum StuttgartOlgahospital Stuttgart Germany
6. Department of Pediatric OncologyUniversity of Zurich Zurich Switzerland
7. St. Anna Kinderspital and St. Anna Kinderkrebsforschung e.V. Vienna Austria
8. Department of Pediatric OncologyUniversity of Wroclaw Wrocław Poland
9. Department of Women's and Children's HealthUppsala University Uppsala Sweden
10. Department of PediatricsHelsinki University Central Hospital Helsinki Finland
11. Department of Pediatric Surgery and UrologyUniversity Children's Hospital Tuebingen Germany
12. Department of Pediatric Hematology and OncologyUniversity Children's Hospital Muenster Munster Germany
13. Hospital for Children and AdolescentsGoethe‐University Frankfurt (Main) Frankfurt Germany
14. Department of Pediatric OncologyUniversity of Tuebingen Tuebingen Germany