1. Department of Public Health, Yonsei University Graduate School, Seoul, Korea.
2. Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Cardiovascular and Metabolic Diseases Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.