1. Department of Food and Nutrition, Chungbuk National University, Gaesin-dong, Heungdeok-gu, Cheongju, Chungbuk 361-763, Korea.
2. Department of Medicine, College of Medicine, Chungbuk National University, Chungbuk 361-763, Korea.
3. Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL 35294, USA.