1. Department of Neurology and Cerebrovascular Center, Seoul National University Bundang Hospital, Seongnam-si, Korea
2. Department of Neurology, Seoul Medical Center, Seoul, Korea
3. Department of Neurology, Soonchunhyang University Hospital Seoul, Seoul, Korea
4. Department of Neurology, Hallym University Sacred Heart Hospital, Anyang-si, Korea
5. Department of Neurology, Dong-A University Hospital, Busan, Korea
6. Department of Neurology, Yeungnam University Medical Center, Daegu, Korea
7. Department of Neurology, Eulji University Hospital, Daejeon, Korea
8. Department of Neurology, Eulji General Hospital, Seoul, Korea
9. Department of Neurology, Inje University Ilsan Paik Hospital, Goyang-si, Korea
10. Department of Neurology, Chonnam National University Hospital, Gwangju, Korea
11. Department of Neurology, Dongguk University Ilsan Hospital, Goyang-si, Korea
12. Department of Biostatistics, Korea University College of Medicine, Seoul, Korea
13. Biostatistical Consulting Unit, Soonchunhyang University Medical Center, Seoul, Korea
14. College of Medicine, University of Cincinnati, Cincinnati, OH, USA
15. Department of Neurology, Seoul National University Hospital, Seoul, Korea