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. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/