1. Department of General, Visceral-, Thoracic-, Transplantation- and Paediatric Surgery, University Medical Center Schleswig-Holstein (UKSH), Campus Kiel, 24105 Kiel, Germany
2. Department of Internal Medicine I, University Medical Centre Schleswig-Holstein (UKSH), Campus Kiel, 24105 Kiel, Germany
3. Department of General Surgery, University Hospital Rostock, 18057 Rostock, Germany
4. Department of Surgery, Israelitisches Krankenhaus, 22297 Hamburg, Germany