1. Clinic for General and Visceral Surgery, Hospital for the Region Fürstenland Toggenburg, CH-9500 Wil, Switzerland
2. Department of Surgery, Hospital of the Canton of St. Gallen, CH-9007 St. Gallen, Switzerland
3. Department of Surgery and Transplantation, University Hospital Zurich, CH-8091 Zurich, Switzerland
4. Department of Surgery, Clarunis—University Centre for Gastrointestinal and Hepatopancreatobiliary Diseases, CH-4002 Basel, Switzerland