1. Colorectal Research Chair, Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
2. Department of Surgery, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
3. Department of Pathology and Laboratory Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia
4. Department of Radiology and Medical Imaging, College of Medicine, King Saud University, Riyadh, Saudi Arabia