1. Department of Neurology, Wonkwang University School of Medicine, Institute of Wonkwang Clinical Medicine, Iksan, Korea.
2. Department of Neurology, Wonkwang University Ansan Municipal Geriatric Hospital, Center for Prevention of Stroke and Dementia, Ansan, Korea.
3. Division of Health and Nutrition Survey, Korea Centers for Disease Control and Prevention, Osong, Korea.
4. Department of Nursing, Wonkwang University College of Medicine, Iksan, Korea.