1Department of Occupational and Environmental Medicine, Kosin University College of Medicine, Busan, Republic of Korea
2Occupational Safety and Health Research Institute, KOSHA, 400, Jongga-ro, Jung-gu, Ulsan, 44429 Republic of Korea
3Department of Occupational and Environmental Medicine, Pusan National University, Yangsan Hospital, Yangsan, South Korea JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/