1. Clinical Oncology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
2. Cancer research department, Swiss Cancer Institute, Zurich, Switzerland
3. Surgery department, Surgical Center Zurich - Hirslanden Hospital Zurich, Switzerland
4. Department of General, Visceral and Transplant Surgery, University of Heidelberg, Heidelberg, Germany
5. OncoCentrum Zurich, Swiss Tumor Immunology Institute (SwissTII), Zurich, Switzerland
6. OncoCentrum Zurich, Gastrointestinal Tumor Center Zurich (GITZ), Zurich, Switzerland
7. Medical Oncology department, Center of Zug, Switzerland