1. Department of Neurology, Hallym University, Seoul, Korea.
2. Department of Neurology, Wonkwang University Sanbon Medical Center, Gunpo, Korea.
3. Wonkwang University Ansan Municipal Geriatric Hospital and Center for Prevention of Stroke and Dementia, Ansan, Korea.
4. Department of Neurology, Wonkwang University, Iksan, Korea.
5. Division of Health and Nutrition Survey, Korea Centers for Disease Control and Prevention, Cheongwon, Korea.
6. Department of Nursing, Wonkwang University College of Medicine, Iksan, Korea.