1. Department of Visceral and Transplantation Surgery; University Hospital Zurich; Zurich Switzerland
2. Division of Endocrinology; Department of Internal Medicine; University Hospital Munich; Munich Germany
3. Department of Radiology and Nuclear Medicine; Triemli Hospital Zurich; Zurich Switzerland
4. Department of Surgery; Cantonal Hospital Frauenfeld; Frauenfeld Switzerland
5. Department of Surgery; Triemli Hospital Zurich; Zurich Switzerland
6. Department of Surgery; Cantonal Hospital Baden; Baden Switzerland