1Department of Occupational & Environmental Medicine, Hallym University Sacred Heart Hospital, Anyang, South Korea
2Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University, Seoul, South Korea
3Department of Occupational & Environmental Medicine, Cheong Ju Medical Center, Cheongju, Korea
4Department of Medical Science, Graduate school of Hallym University, Chuncheon, South Korea JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/