1. Department of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
3. Department of Radiology, Kangbuk Samsung Medical Center, Seoul, Korea.
4. Department of Radiology, Soonchunhyang University Seoul Hospital, Seoul, Korea.
5. Department of Radiology, Human Medical Imaging and Intervention Center, Seoul, Korea.