1. Department of Preventive Medicine, College of Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea.
2. Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea.
3. Division of Life Science, Korea University, Seoul, Korea.
4. BK21FOUR R&E Center for Learning Health Systems, Korea University, Seoul, South Korea.
5. Wonjin Institute for Occupational & Environmental Health, Seoul, Korea.
6. Institute of Health and Environment, Seoul National University, Seoul, Korea.
7. National Cancer Center, Goyang, Korea.
8. Graduate School of Public Health, Seoul National University, Seoul, Korea.