1. Klinikum Stuttgart – OlgahospitalStuttgart Cancer Center, Zentrum für Kinder‐, Jugend‐ und Frauenmedizin, Pediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
2. Section of Pediatric Pathology, Department of PathologyKiel Pediatric Tumor Registry Kiel Germany
3. Department of Pediatric SurgeryUniversity Children's Hospital Marburg Marburg Germany
4. Klinikum Stuttgart – OlgahospitalStuttgart Cancer Center, Zentrum für Kinder‐, Jugend‐ und Frauenmedizin, Olgahospital, Institute of Radiology Stuttgart Germany
5. Klinikum StuttgartInstitute of Radiotherapy Stuttgart Germany
6. Department of Pediatric Hematology and OncologyUniversity of Muenster Muenster Germany
7. Department of Pediatric Hematology/Oncology and BMTUniversity of Wroclaw Wroclaw Poland
8. Pediatric OncologySt. Anna Kinderspital Wien Austria
9. Department of Pediatric OncologyUniversity of Zurich Zurich Switzerland
10. Department of Women's and Children's HealthChildren's University Hospital, University of Uppsala Uppsala Sweden
11. Department of Pediatric Surgery and UrologyUniversity Children's Hospital Tuebingen Germany
12. Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, Faculty of MedicineUniversity of Freiburg Freiburg Germany
13. Department of Pediatric Hematology and OncologyChildren's Hospital Tuebingen Germany
14. Department for Children and AdolescentsUniversity Hospital of Frankfurt Frankfurt/M. Germany