1. School of Pharmacy, Sungkyunkwan University, Suwon, 440-746, Korea
2. Department of Food Science and Human Nutrition, Chonbuk National University, Jeonju 561-756, Korea
3. Faculty of Food Science and Biotechnology, Pukyoung National University, Busan 608-737, Korea
4. College of Pharmacy, Seoul National University, Seoul 151-742, Korea