[1
]
Department of Neurosurgery, Spine and Spinal Cord Institute, Gangnam Severance Spine
Hospital, Yonsei University College of Medicine, Seoul, Korea. Electronic address:
ahnsangsoak@hanmail.net.
[2
]
Department of Neurosurgery, Spine and Spinal Cord Institute, Gangnam Severance Spine
Hospital, Yonsei University College of Medicine, Seoul, Korea.
[3
]
Department of Radiology, Dong-A University Medical Center, Busan, Korea.
[4
]
Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea.
[5
]
Department of Neurosurgery, 21 Century Hospital, Jeju, Korea.