1. Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Neurology, Uijeongbu St. Mary's Hospital, The Catholic University of Korea College of Medicine, Uijeongbu, Korea.
3. Department of Neurology, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
4. Department of Neurology, Seoul Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Neurology, Eulji University School of Medicine, Seoul, Korea.
6. Department of Neurology, Chungnam National University College of Medicine, Daejeon, Korea.
7. Department of Neurology, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
8. Department of Neurology, Gangnam Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
9. Department of Neurology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
10. Department of Neurology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.