1. Department of Radiology, Soonchunhyang University Bucheon Hospital, Gyunggi-do 420-020, Korea.
2. Department of Radiology, Konyang University Hospital, Daejeon 302-718, Korea.
3. Department of Radiology, Soonchunhyang University Hospital, Seoul 140-743, Korea.
4. Department of Forensic Medicine, National Institute of Scientific Investigation, Seoul 158-707, Korea.