1. Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
2. Department of Internal Medicine, King Abdulaziz Medical City, Jeddah, Saudi Arabia
3. Department of Critical Care Medicine, King Abdulaziz Medical City, Riyadh, Saudi Arabia
4. Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. Department of Community Medicine, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
6. Department of Surgery, International Medical Center, Jeddah, Saudi Arabia