1. Department of Medicine University Medical Centre Hamburg‐Eppendorf Hamburg Germany
2. Department of Paediatric Haematology and Oncology University Hospital Münster Münster Germany
3. Department of Nuclear Medicine University Hospital Münster Münster Germany
4. West German Cancer Centre (WTZ) Network, Essen and Muenster Germany
5. Orthopaedic Hospital Volmarstein Wetter Germany
6. Department of Orthopaedics and Tumour Orthopaedics University Hospital Münster Münster Germany
7. Department of Oncologic Musculoskeletal Surgery University Hospital Essen Essen Germany
8. Paediatrics III University Hospital Essen Essen Germany
9. Department of Radiology University Hospital Münster Münster Germany
10. Department of Clinical Radiology Klinikum Ibbenbüren Ibbenburen Germany
11. DKTK German Cancer Research Centre Essen Germany