1. Department of Neurology, Ewha Womans University School of Medicine, Seoul, Korea.
2. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Neurology, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
4. Department of Food and Nutrition and Institute of Health Sciences, Korea University, Seoul, Korea.
5. Department of Molecular Medicine, Ewha Womans University School of Medicine, Seoul, Korea.