1. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Neurology, National Police Hospital, Seoul, Korea.
3. Integrative Research Center for Cerebrovascular and Cardiovascular Diseases, Yonsei University College of Medicine, Seoul, Korea.
4. Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Neurology, Ewha Womans University School of Medicine, Seoul, Korea.