Dong-Kyu Yeo1, Jung E Park2, Kyum-Yil Kwon3. 1. Department of Neurosurgery, Soonchunhyang University Gumi Hospital, Soonchunhyang University School of Medicine, Gumi, Republic of Korea. 2. Department of Neurology, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Republic of Korea. 3. Department of Neurology, Soonchunhyang University Seoul Hospital, Soonchunhyang University School of Medicine, 59 Daesagwan-ro, Yongsan-gu, Seoul, 04401, Republic of Korea. denovo78@schmc.ac.kr.