1. Pediatrics 5; Olgahospital; Klinikum Stuttgart Stuttgart Germany
2. Kiel Peadiatric Tumour Registry, Department of Pediatric Pathology; University Hospital Kiel; Germany
3. Radiologisches Institut; Olgahospital; Klinikum Stuttgart Stuttgart Germany
4. Radiation Oncology; Klinikum Stuttgart Stuttgart Germany
5. Pediatric Oncology Clinic; Heinrich-Heine-University Düsseldorf; Düsseldorf Germany
6. Pediatric Hematology and Oncology; University Hamburg-Eppendorf; Hamburg Germany
7. Children's Hospital, Pediatric Oncology; University Würzburg; Würzburg Germany
8. Pediatric Hematology and Oncology; University Medical Center Göttingen; Göttingen Germany
9. Pediatric Hematology and Oncology; University Medical Center Aachen; Aachen Germany
10. Internal Medicine 5; University Hospital Erlangen; Erlangen Germany
11. Hematology/Oncology; University of Halle; Halle Germany
12. Sarcoma Center, West German Cancer Center; University of Duisburg-Essen; Essen Germany
13. Department of Pediatric Hematology/Oncology and BMT; University of Wroclaw; Wroclaw Poland
14. Pediatric Oncology; University of Zürich; Zürich Switzerland
15. St. Anna Kinderspital and St. Anna Kinderkrebsforschung e.V.; Vienna Austria
16. Department of Women’s and Children’s Health; Uppsala University; Uppsala Sweden
17. Pediatrics; Helsinki University Central Hospital; Helsinki Finland
18. Pediatric Surgery; University Hospital Tübingen; Tübingen Germany
19. Pediatric Hematology and Oncology; University Children’s Hospital Münster; Münster Germany
20. Department for Children and Adolescents; University Hospital, Goethe-University Frankfurt (Main); Frankfurt Germany
21. Pediatric Hematology and Oncology; University of Tübingen; Tübingen Germany