1. Department of Medical Oncology and Hematology, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
2. Department of Visceral Surgery and Medicine, University of Berne, Berne, Switzerland
3. Pathology Viollier, Basel, Switzerland
4. Department of Surgery, Lindenhof Hospital, Berne, Switzerland
5. Department of Surgery, Cantonal Hospital Olten, Olten, Switzerland
6. Department of Surgery, University Hospital Basel, Basel, Switzerland
7. Department of Surgery, Vaudois University Hospital Center, Lausanne, Switzerland