1. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
2. Integrative Research Institute for Cerebrovascular and Cardiovascular Diseases, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Neurology, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.