1. Department of Neurology, The Catholic University of Korea College of Medicine, Bucheon St. Mary's Hospital, Bucheon, Korea.
2. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Neuroscience Center, Samsung Medical Center, Seoul, Korea.
5. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.