1Department of Occupational Medicine, Dong-A University Hospital, Korea.
2Department of Preventive Medicine, College of Medicine, Dong-A University, Korea. yshong@daunet.donga.ac.kr
3Medical Research Center for Cancer Molecular Therapy, Dong-A University, Korea.
4Department of Occupational Medicine, College of Medicine, Dong-A University, Korea.
5Center of Occupational and Environmental Medicine, Incheon Sarang Hospital, Korea.
6Department of Occupational Medicine, Hallym University Sacred Heart Hospital, Korea.
7Department of Occupational and Environmental Medicine, College of Medicine, Soonchunhyang University, Korea.