1Department of Preventive Medicine, Ewha Womans University, Medical College, Armed Forces Medical Command, Korea.
2Institute for Occupational and Environmental Health, Korea University, Korea.
3Federation of Korean Trade Unions Industrial Safety Bureau, Korea.
4Department of Occupational Medicine. Hallym University Sacred Heart Hospital, Korea.
5Department of Occupational and Environmental Medicine, Dankook University, Korea.
6Department of Preventive Medicine. Eulji University School of Medicine, Korea.
7School of Public Health and Institute of Health and Environment, Seoul National University, Korea. paekdm@snu.ac.kr