1. Department of General and Trauma Surgery, BG-University Hospital Bergmannsheil, Ruhr-University, Bochum, Germany
2. Department of General and Trauma Surgery, Medical School Hannover, Hannover, Germany
3. Department of Spinal Cord Injury, BG-University Hospital Bergmannsheil, Ruhr-University, Bochum, Bochum, Germany
4. Professor; Department of General, Trauma and Reconstructive Surgery, Munich University Hospital LMU, Munich, Germany