1. Department of Neurology, Jeju National University Hospital, Jeju National University College of Medicine, Jeju, Korea.
2. Institute of Medical Science, Jeju National University, Jeju, Korea.
3. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
4. Department of Neurology, Eulji University Hospital, Daejeon, Korea.
5. Department of Neurology, Eulji General Hospital, Eulji University, Seoul, Korea.
6. Department of Neurology, Seoul Medical Center, Seoul, Korea.
7. Department of Neurology, Ilsan Paik Hospital, Inje University, Goyang, Korea.
8. Department of Neurology, Soonchunhyang University College of Medicine, Seoul, Korea.
9. Department of Neurology, Yeungnam University Hospital, Daegu, Korea.
10. Department of Neurology, Dongguk University Ilsan Hospital, Goyang, Korea.
11. Department of Neurology, Dong-A University College of Medicine, Busan, Korea.
12. Department of Neurology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
13. Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Korea.
14. Clinical Research Center, Asan Medical Center, Seoul, Korea.
15. Department of Neurology, University of California San Francisco, San Francisco, CA, USA.