1. Department of Preventive Medicine, College of Medicine, Chungbuk National University, Cheongju, Korea.
2. Chungbuk Environmental Health Center, Chungbuk University Hospital, Cheongju, Korea.
3. Environmental Health Research Division, Environmental Health Research Department, National Institute of Environmental Research, Incheon, Korea.
4. Department of Preventive Medicine, College of Medicine, Dong-A University, Busan, Korea.
5. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea.
6. Environment Division, Eurofins Korea Co. Ltd., Gunpo, Korea.
7. Chungbuk Regional Cancer Center, Chungbuk National University Hospital, Cheongju, Korea.