1. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Neuroscience Center, Samsung Medical Center, Seoul, Korea.
3. Department of Neurology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
4. Department of Neurology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
5. Department of Neurology, Inha University Hospital, Incheon, Korea.
6. Department of Neurology, College of Medicine, Gyeongsang Institute of Health Science, Gyeongsang National University, Jinju, Korea.
7. Department of Neurology, Gyeongsang National University Changwon Hospital, Changwon, Korea.
8. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
9. Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences & Technology (SAIHST), Sungkyunkwan University, Seoul, Korea.