1. Department of Food and Nutrition, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Korea.
2. Department of Anatomy and Cell Biology, College of Medicine, Hanyang University, Seoul 133-791, Korea.
3. Department of Nuclear Medicine, College of Medicine, Kyung Hee University, Seoul 130-702, Korea.