1. Department of Plastic & Reconstructive Surgery, University Hospital USZ, University of Zurich, 8000 Zurich, Switzerland
2. Department of Orthopedics & Trauma, Sarcoma Service, LUKS University Hospital, University of Lucerne, 6000 Lucerne, Switzerland
3. Department of Trauma Surgery and Orthopedics, Ortenau Klinikum, 77654 Offenburg, Germany
4. Department of Orthopedics and Trauma, Sarcoma Service, Kantonsspital Winterthur, 8400 Winterthur, Switzerland