1. Institute for Health Promotion and Department of Epidemiology and Health Promotion, Graduate School of Public Health, Yonsei University, Seoul 120-752, Korea.
2. Department of Public Health, Graduate School of Yonsei University, Seoul 120-752, Korea.
3. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul 120-752, Korea.
4. Metabolic Syndrome Research Initiatives, Seoul 120-752, Korea.
5. Department of Biomedical Laboratory Science, College of Health Sciences, Eulji University, Seongnam 461-713, Korea.