1. Department of Neurosurgery, Jeju National University College of Medicine, Jeju, Republic of Korea.
2. Department of Neurology, Konkuk University Medical Center, Seoul, Republic of Korea.
3. Department of Radiology and Hallym University College of Medicine, Chuncheon, Republic of Korea.
4. Department of Neurosurgery, Hallym University College of Medicine, Chuncheon, Republic of Korea.