Hyung Lee1,2, Hyun Ah Kim3,4. 1. Department of Neurology, Keimyung University School of Medicine, 56 Dalseong-ro, Jung-gu, Daegu, 700-712, Republic of Korea. 2. Brain Research Institute, Keimyung University School of Medicine, Daegu, Republic of Korea. 3. Department of Neurology, Keimyung University School of Medicine, 56 Dalseong-ro, Jung-gu, Daegu, 700-712, Republic of Korea. kha0206@dsmc.or.kr. 4. Brain Research Institute, Keimyung University School of Medicine, Daegu, Republic of Korea. kha0206@dsmc.or.kr.