1. Department of Neurology, Hyoja Geriatric Hospital, Yongin, Korea.
2. Department of Neurology, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Cardiology, Soonchunhyang University College of Medicine, Seoul, Korea.
4. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Neurology, Bobath Memorial Hospital, Seongnam, Korea.