1. Medical Oncology, Oncology Center, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
2. Department of Medicine, Qassim Medical College, Qassim University, Qassim, Saudi Arabia
3. Clinical Oncology and Nuclear Medicine Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
4. Medical Oncology Department, Prince Mohamed Bin Naser Hospital, Gizan, Saudi Arabia