1. University Teaching Hospital LUKS, Lucerne, Sarcoma Service, University of Lucerne, 6000 Lucerne, Switzerland
2. University Hospital USZ, Sarcoma Servuce, University of Zurich, 8000 Zurich, Switzerland
3. Pathologie Institut Enge, University of Zurich, 8000 Zurich, Switzerland
4. Kantonsspital Winterthur, Sarcoma Service, 8400 Winterthur, Switzerland