1. Department of Diagnostic Radiology, Wooridul Spine Hospital, Seoul, Korea.
2. Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea.
3. Department of Pathology, Wooridul Spine Hospital, Seoul, Korea.
4. T and C Pathology Hospital, Seoul, Korea.
5. Department of Diagnostic Radiology, Pochon CHA University, Bundang CHA Hospital, Sungnam-si, Korea.
6. Department of Diagnostic Radiology, Yongdong Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.