1. Department of Pathology, King Faisal Specialist Hospital and Research Institute, Riyadh, Saudi Arabia
2. Department of Radiation Oncology, King Faisal Specialist Hospital and Research Institute, Riyadh, Saudi Arabia
3. Department of Biostatistics, Epidemiology and Scientific Computing, King Faisal Specialist Hospital and Research Institute, Riyadh, Saudi Arabia
4. Department of Medicine, King Faisal Specialist Hospital and Research Institute, Riyadh, Saudi Arabia
5. Department of Surgery, King Faisal Specialist Hospital and Research Institute, Riyadh, Saudi Arabia