1. Pediatrics 5 (Oncology, Hematology, Immunology), Olgahospital, Klinikum StuttgartStuttgart Germany
2. Pediatric Surgery, Olgahospital, Klinikum StuttgartStuttgart Germany
3. Department of Pediatric Pathology, Kiel Paediatric Tumor Registry, University Hospital of Schleswig‐HolsteinCampus Kiel Germany
4. Pediatric Radiology, Radiologisches Institut, Olgahospital, Klinikum StuttgartStuttgart Germany
5. Department of Radiation OncologyKlinikum StuttgartStuttgart Germany
6. Department of Pediatric OncologyUniversity of WroclawWroclaw Poland
7. Department of Pediatric OncologyUniversity of ZuerichZuerich Switzerland
8. Department of Pediatric Surgery and UrologyUniversity Children’s HospitalTuebingen Germany
9. Department of Pediatric Hematology and OncologyUniversity Children’s HospitalMuenster Germany
10. Hospital for Children and Adolescents, Goethe‐University Frankfurt (Main)Frankfurt Germany
11. Department of Pediatric OncologyUniversity of TuebingenTuebingen Germany