1. Department of Neurology, H PLUS YANGJI Hospital, Seoul, Korea.
2. Department of Neurology, Gyeonggi Provincial Medical Center Icheon Hospital, Icheon, Korea.
3. Department of Neurology, Cerebrovascular Center, Seoul National University Bundang Hospital, Seoul National University, Seongnam, Korea.
4. Department of Emergency Medicine, Gyeonggi Provincial Medical Center Icheon Hospital, Icheon, Korea.
5. Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.