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 Radiology, Inje University Haundae Paik Hospital, Busan, Korea.
4. Department of Radiology, Hanyang University Guri Hospital, Guri, Korea.
5. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Radiology, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
7. Department of Radiology, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.