1. Department of Radiology, Seoul National University Bundang Hospital, Seongnam 13620, Korea.
2. Department of Radiology, Chung-Ang University Hospital, Seoul 06973, Korea.
3. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam 13620, Korea.
4. Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam 13620, Korea.
5. Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seongnam 13620, Korea.