1. Department of Radiology, Inje University College of Medicine, Busan Paik Hospital, Busan, Korea.
2. Department of Orthopaedic Surgery, Inje University College of Medicine, Busan Paik Hospital, Busan, Korea.
3. Department of Neurosurgery, Inje University College of Medicine, Busan Paik Hospital, Busan, Korea.
4. Department of Radiology, Seoul National University Bundang Hospital, Seoul, Korea.