1. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Inflammatory Bowel Disease Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Digestive Diseases Research Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.