1. Department of Neurology, Ewha Womans University School of Medicine and Ewha Medical Research Institute, Seoul, Korea.
2. Department of Medical Science, Ewha Womans University School of Medicine and Ewha Medical Research Institute, Seoul, Korea.
3. Department of Neurology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine and Samsung Biomedical Research Institute, Changwon, Korea.
4. Department of Radiology, Ewha Womans University School of Medicine and Ewha Medical Research Institute, Seoul, Korea.