1. Clinical Oncology Department, Faculty of Medicine; Ain Shams University; Cairo Egypt
2. Department of Medical Oncology; Gastrointestinal Tumor Center Zurich; Zurich Switzerland
3. Surgical Center Zurich; Hirslanden Hospital Zurich; Zurich Switzerland
4. Department of General, Visceral and Transplant Surgery; University of Heidelberg; Heidelberg Germany
5. Department of Surgery; Cambridge University Hospital; Cambridge United Kingdom
6. Department of HPB and Liver Transplantation, Rajhy Liver Hospital; Assiut University; Assiut Egypt