1. Department of Neurology, Stroke Center, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Radiology, Stroke Center, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Neurology, Chungbuk National University College of Medicine, Cheongju, Korea.
4. Department of Neurology, Dongguk University College of Medicine, Gyeongju Hospital, Gyeongju, Korea.