1. Department of Neurology and the CRCS, Seoul National University Hospital, Seoul, Korea.
2. Department of Neurology, Dongguk University Ilsan Hospital, Goyang, Korea.
3. Department of Neurology, Cerebrovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Neurology and the CRCS, Seoul National University Hospital, and Neuroscience Research Institute, College of Medicine, Seoul National University, Seoul, Korea.