1 Research Administration Team, Seoul National University Bundang Hospital, Seongnam, South Korea.
2 Department of Neurology, Daegu Catholic University College of Medicine, Daegu Catholic University Hospital, Daegu, South Korea.
3 Department of Neurology, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707, South Korea. jisookim@snu.ac.kr.
4 Dizziness Center, Clinical Neuroscience Center, Seoul National University Bundang Hospital, Seongnam, South Korea. jisookim@snu.ac.kr.