1. Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Neurology, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
3. Department of Neurology, Seoul Medical Center, Seoul, Korea.
4. Department of Neurology, Soonchunhyang University Hospital Cheonan, Soonchunhyang University College of Medicine, Cheonan, Korea.
5. Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Neurology, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
7. Department of Neurology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea.
8. Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.