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