1. Faculty of Medicine, Ain Shams University, Cairo, Egypt
2. Department of Oncology, Swiss Cancer Institute, Cham, Switzerland
3. Surgical Center Zurich, Hirslanden Hospital Zurich, 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. Department of Oncology, Zentrum für Integrative Onkologie, Zurich, Switzerland
8. Clinical Oncology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt