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Dept. of Preventive Medicine, Ewha Womans University, Medical College, Armed Forces Medical Command , Institute for Occupational and Environmental Health, Korea University , Federation of Korean Trade Unions Industrial Safety Bureau , Dept. of Occupational Medicine. Hallym University Sacred Heart Hospital , Dept. of Occupational and Environmental Medicine, Dankook University , Dept. of Preventive Medicine.
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Jung-Choi et al. (2004) studied this question.
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