Hyung-Eun Park1, Ji-Eun Lee1, Byung-Chul Son2, Joong-Seok Kim3. 1. Department of Neurology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 222, Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea. 2. Department of Neurosurgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. 3. Department of Neurology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 222, Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea. neuronet@catholic.ac.kr.