1. Assistant Professor of Anesthesia and Pain Relief NCI, Cairo University, Giza, Egypt
2. Professor of Anesthesia and Pain Relief NCI, Cairo University, Giza, Egypt
3. Assistant Professor of Anesthesia, ICU and Pain Relief, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
4. Assistant Professor of Surgical Oncology, NCI, Cairo University, Giza, Egypt
5. Lecturer of Surgical Oncology NCI, Cairo University, Giza, Egypt