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