1. Department of Radiology, Seoul St. Mary’s Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea.
2. Department of Radiology, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea.
3. Department of Radiology, Bucheon St. Mary’s Hospital, College of Medicine, the Catholic University of Korea, Bucheon, Korea.
4. Department of Radiology, Hanyang University Guri Hospital, College of Medicine, Hanyang University, Guri, Korea.
5. Department of Radiology, Severance Hospital, College of Medicine, Yonsei University, Seoul, Korea.
6. Department of Radiology, Gangnam Severance Hospital, College of Medicine, Yonsei University, Seoul, Korea.
7. Department of Radiology, Korea University Guro Hospital, College of Medicine, Korea University, Seoul, Korea.
8. Department of Radiology, St. Vincent’s Hospital, College of Medicine, the Catholic University of Korea, Suwon, Korea.