1. Sarcoma Service, Department of Orthopaedics and Trauma, University Teaching Hospital LUKS, 6000 Lucerne, Switzerland
2. Health Sciences and Medical Faculty, University of Lucerne, 6001 Lucerne, Switzerland
3. Sarcoma Service, Department of Orthopaedics and Trauma, Kantonsspital Winterthur, 8400 Winterthur, Switzerland
4. Sarcoma Service, University Hospital USZ, University of Zurich, 8000 Zurich, Switzerland
5. Pathologie Institut Enge, University of Zurich, 8000 Zurich, Switzerland