1. Medical Oncology, Oncology Centre, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
2. Department of Clinical Oncology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
3. Department of Clinical Oncology and Nuclear Medicine, Faculty of Medicine, Menoufia University, Shebin El Kom, Egypt
4. Department of Medical Oncology, National Cancer Institute, Cairo University, Cairo, Egypt
5. Department of Biostatistics, Epidemiology and Scientific Computing, Research Center, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia