1. Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin 17104, Korea.
2. College of Nursing, Seoul National University, Seoul 03080, Korea.
3. Research Institute of Nursing Science, Seoul National University, Seoul 03080, Korea.
4. National Standard Reference Data Center for Korean EEG, Seoul 03080, Korea.
5. Research Institute of Medical Nutrition, Kyung Hee University, Seoul 02447, Korea.