1. Department of Neurology and Cerebrovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.