1. Department of Preventive Medicine, College of Medicine, Dong-A University, Busan, Korea.
2. Heavy Metal Exposure Environmental Health Center, Dong-A University, Busan, Korea.
3. Institute of Environmental and Occupational Medicine, College of Medicine, Soonchunhyang University, Asan, Korea.
4. Department of Preventive Medicine, College of Medicine, Chung-Ang University, Seoul, Korea.
5. Department of Preventive Medicine, College of Medicine, Yeungnam University, Daegu, Korea.
6. Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea.
7. Department of Preventive and Occupational Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea.
8. Department of Environmental Health Research, National Institute of Environmental Research, Incheon, Korea.