1. Department of Trauma, Hand and Reconstructive Surgery/Division Plastic and Reconstructive Surgery, University Hospital Essen, Germany
2. Department of Tumor Orthopedics and Sarcoma Surgery, University Hospital Essen, Germany
3. Department of Plastic and Reconstructive Surgery, St. Rochus-Hospital, Castrop-Rauxel, Germany
4. Ruhr-University Bochum, Germany