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