1. Department of Environmental Health, D&C Inc, Incheon, South Korea
2. National Cancer Center, National Cancer Control Institute, Goyang-si, Gyeonggi-do, South Korea
3. Graduate School of Public Health, Yonsei University, Seoul, South Korea
4. The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul, South Korea
5. Department of Occupational and Environmental Medicine, Severance Hospital, Yonsei University Health System, Seoul, South Korea