[1] Pusan Natl Univ, Yangsan Hosp, Dept Occupat & Environm Med, Yangsan, South Korea
[2] Pusan Natl Univ, Sch Med, Dept Prevent & Occupat Med, Yangsan, Gyongnam, South Korea
[3] Korea Occupat Safety & Hlth Agcy, Occupat Safety & Hlth Res Inst, Ulsan, South Korea
[4] Inje Univ, Haeundae Paik Hosp, Dept Occupat & Environm Med, Busan, South Korea
[5] Yonsei Univ, Dept Occupat & Environm Hlth, Grad Sch Publ Hlth, Seoul, South Korea
[6] Catholic Univ, Dept Occupat & Environm Med, Coll Med, Seoul, South Korea
[7] Ajou Univ, Dept Occupat & Environm Med, Sch Med, Suwon, South Korea
[8] Ewha Womans Univ, Dept Prevent Med, Sch Med, Seoul, South Korea
[9] Yonsei Univ, Wonju Severance Christian Hosp, Dept Occupat & Environm Med, Wonju Coll Med, Wonju, South Korea
[10] Yonsei Univ, Wonju Coll Med, Dept Prevent Med, Wonju, South Korea
[11] Yonsei Univ, Wonju Coll Med, Inst Occupat & Environm Med, Wonju, South Korea