Ignazio Tarantino1, Rene Warschkow, Ulrich Güller. 1. Department of General, Abdominal and Transplant Surgery, University of Heidelberg, Heidelberg, Germany Department of Surgery, Kantonsspital St. Gallen, Gallen, Switzerland, Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany Division of Medical Oncology and Hematology, Kantonsspital St. Gallen, St. Gallen, Switzerland, University Clinic for Visceral Surgery and Medicine, University Hospital Berne, Berne, Switzerland.