Eek-Sung Lee1, Ki-Bum Sung1, Tae-Kyeong Lee2. 1. From the Department of Neurology, Soonchunhyang University College of Medicine, Bucheon, Korea. 2. From the Department of Neurology, Soonchunhyang University College of Medicine, Bucheon, Korea. xorudoc@schmc.ac.kr.