1. Department of Food and Nutrition, Seoul National University, Seoul 151-742, Korea.
2. Department of Biotechnology, Hoseo University, Asan 336-795, Korea.
3. Institute on Aging, Seoul National University, Seoul 110-799, Korea.
4. Research Institute of Human Ecology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.