1. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.
2. Institute of Human Environment Interface Biology, Seoul National University College of Medicine, Seoul 03080, Korea.
3. Department of Food and Nutrition, Seoul National University College of Human Ecology, Seoul 08826, Korea.
4. Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06951, Korea.