1. Department of Orthopaedics and TraumaMedical University of Graz Graz Austria
2. University Hospital Zurich Zurich Switzerland
3. Department of OrthopaedicsLeiden University Medical Centre ZA Leiden The Netherlands
4. Division of Clinical Oncology, Internal MedicineMedical University of Graz Graz Austria
5. Diagnostic and Research Institute of PathologyMedical University of Graz Graz Austria
6. Department of Orthopaedic OncologyHELIOS‐Klinikum Berlin‐Buch Berlin Germany
7. Tumour Orthopaedics and Sarcoma SurgeryHELIOS Klinikum Bad Saarow Bad Saarow Germany