1. Clinical Oncology Department, Faculty of Medicine, Ain Shams University, Lotfy Elsayed Street, Cairo, 11566, Egypt
2. Faculty of Medicine, Ain Shams University, Cairo, Egypt
3. Oncology Department, Swiss Cancer Institute, Cham, Switzerland 3OncoCentrum Zurich, Gastrointestinal Tumor Center Zurich (GITZ), Zurich, Switzerland
4. Surgical Center Zurich – Hirslanden Hospital Zurich, Zurich, Switzerland
5. Surgery Department, University of Jena, Jena, Germany
6. Oncology Department, Zentrum für Integrative Onkologie, 8001 Zurich, Switzerland