1. Institute of New Frontier Research Team, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea
2. Department of Neurology, Konkuk University Medical Center, Seoul 05030, Republic of Korea
3. Department of Neurosurgery, Kangwon National University College of Medicine, Chuncheon 24341, Republic of Korea
4. Department of Neurosurgery, Hallym University College of Medicine, Chuncheon 24253, Republic of Korea