1. Department of Plastic & Reconstructive Surgery, University of Grenoble, 38000 Grenoble, France
2. Department of Plastic & Reconstructive Surgery, University of Zurich, 8091 Zurich, Switzerland
3. Department of Health Sciences and Medicine, University of Lucerne, 6000 Lucerne, Switzerland
4. University Teaching Hospital LUKS Lucerne Sarcoma Surgery, University of Lucerne, 6000 Lucerne, Switzerland
5. Patho Enge, University of Zurich, 8000 Zurich, Switzerland
6. Kantonsspital Winterthur (KSW), 8400 Winterthur, Switzerland
7. University Hospital Zurich (USZ), 8000 Zurich, Switzerland