1. Medical Oncology Section, Oncology Centre, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11564, Saudi Arabia
2. Clinical Oncology Department, Faculty of Medicine, Menoufia University, Shebin El Kom 32511, Egypt
3. Clinical Oncology Department, Faculty of Medicine, Ain Shams University, Cairo 11591, Egypt
4. Clinical Oncology and Nuclear Medicine Department, Suez Canal University Hospitals, Ismailia 41522, Egypt
5. Surgical Oncology Department, King Faisal Specialist Hospital and Research Center, P.O. Box 3354, Riyadh 11564, Saudi Arabia
6. Radiation Oncology Section, King Faisal Specialist Hospital and Research Center, P.O. Box 3354, Riyadh 11564, Saudi Arabia
7. Anatomic Pathology Department, King Faisal Specialist Hospital and Research Center, P.O. Box 3354, Riyadh 11564, Saudi Arabia