1. Preventive Medicine and Health Promotion Research Center, Kyungpook National University, Daegu, Korea
2. Department of Endocrinology, School of Medicine, Kyungpook National University, Daegu, Korea
3. Laboratory of Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
4. Department of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, Minnesota
5. Department of Nutrition, University of Oslo, Oslo, Norway