1. Sarcoma Service, University Teaching Hospital LUKS, University of Lucerne, 6000 Lucerne, Switzerland
2. University Hospital USZ, University of Zurich, 8000 Zurich, Switzerland
3. Sarcoma Service, Kantonsspital Winterthur, 8400 Winterthur, Switzerland
4. Patho Enge, SSN Reference Sarcoma Pathology, University of Zurich, 8000 Zurich, Switzerland