1. Department of Surgery, Al-Amiri Hospital, Kuwait City, Kuwait.
2. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Pathology, and Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.