1. University Hospital Muenster; Westphalian-Wilhelms University; Muenster Germany
2. Department of Internal Medicine; University Medical Centre Hamburg-Eppendorf; Hamburg Germany
3. Paediatrics III, West German Cancer Centre; University Hospital of Essen; Essen Germany
4. Paediatric Oncology and Haematology, University Hospital Schleswig-Holstein, Campus Luebeck; Luebeck Germany
5. Paediatric Haematology and Oncology; University Hospital Muenster; Muenster Germany
6. Department of Orthopaedic and Trauma Surgery, University Hospital of Essen; University of Duisburg-Essen; Essen Germany
7. Department of Clinical Radiology; University Hospital Muenster; Muenster Germany
8. Department of Nuclear Medicine; University Hospital Muenster; Muenster Germany
9. Department of Paediatric Oncology and Haematology; University Children's Hospital of Cologne; Cologne Germany
10. Department of Paediatric Haematology and Oncology; University Medical Centre Hamburg-Eppendorf; Hamburg Germany
11. Department of Paediatric Haematology, Oncology, and Stem Cell Transplantation, Children's Hospital Regensburg; University of Regensburg; Regensburg Germany
12. Paediatrics 5 (Oncology, Haematology, and Immunology), Klinikum Stuttgart; Olgahospital; Stuttgart Germany
13. Department of Internal Medicine; University Hospital of Ulm; Ulm Germany
14. Department of Oncology and Haematology; University Children's Hospital Basel; Basel Switzerland
15. Paediatric Oncology, Emma Children's Hospital, Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
16. Clinical Oncology; Leiden University Medical Centre; Leiden The Netherlands
17. Sarcoma Centre, West German Cancer Centre; University Hospital of Essen; Essen Germany
18. German Cancer Research Centre; Essen Germany