1. Department of Radiology, The Catholic University of Korea, St. Paul's Hospital, Seoul, Korea.
2. Department of Radiology, The Catholic University of Korea, Bucheon St. Mary's Hospital, Bucheon, Korea.
3. Department of Orthopedic Surgery, The Catholic University of Korea, Bucheon St. Mary's Hospital, Bucheon, Korea.
4. Department of Radiology, The Catholic University of Korea, St. Mary's Hospital, Seoul, Korea.
5. Department of Radiology, The Catholic University of Korea, St. Vincent's Hospital, Suwon, Korea.