1. Department of General and Visceral Surgery, Medical Center - University of Freiburg , Hugstetter Str. 55, 79106 Freiburg , Germany
2. Institute for Surgical Pathology, Medical Center - University of Freiburg, Faculty of Medicine - University of Freiburg , Breisacher Str. 115A, 79106 Freiburg , Germany
3. Department of Surgery, University Medical Center Schleswig-Holstein, UKSH Campus Lübeck , Ratzeburger Allee 160, 23538 Lübeck , Germany