1. Department of Radiology, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul 03181, Korea.
2. Department of Radiology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu 41931, Korea.
3. Department of Orthopaedic Surgery, Dongsan Medical Center, Keimyung University School of Medicine, Daegu 41931, Korea.
4. Department of Radiology, Inje University College of Medicine, Busan Paik Hospital, Busan 47392, Korea.