1. Department of General Visceral and Thoracic Surgery; University Medical Center Hamburg-Eppendorf; Hamburg Germany
2. Department of Biochemistry and Signal Transduction; University Medical Center Hamburg-Eppendorf; Hamburg Germany
3. Department of Surgery; University of Lübeck; Lübeck Germany
4. Department of Anatomy and Experimental Morphology; University Medical Center Hamburg-Eppendorf; Hamburg Germany