1 Department of Neurology, Hallym University Sacred Heart Hospital, Hallym Neurological Institute, Hallym University College of Medicine, Anyang, Korea.
2 Department of Neurology, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3 Department of Neurology, Anam Hospital, Korea University College of Medicine, Seoul, Korea.
4 Department of Neurology, Kangwon National University Hospital, Kangwon National University, Chuncheon, Korea.
5 Department of Neurology, Hanyang University Guri Hospital, Guri, Korea.
6 Department of Neurology, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea.
7 Department of Neurology, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
8 Department of Neurology, Seoul National University Bundang Hospital, Seoul National University, Seongnam, Korea.
9 Department of Neurology, Anam Hospital, Korea University College of Medicine, Seoul, Korea. kunu@korea.ac.kr.