[1] Korea Canc Ctr Hosp, Asan Med Ctr, Seoul, South Korea
[2] Korea Canc Ctr Hosp, Dept Pediat, Seoul, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Pediat,Childhood Asthma Atopy Ctr,Res Ctr St, Seoul, South Korea
[4] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Pediat,Childhood Asthma Atopy Ctr,Environm H, Seoul, South Korea
[5] Dankook Univ, Coll Med, Dept Prevent Med, Seoul, South Korea
[6] Dankook Univ, Grad Sch, Dept Publ Hlth, Cheonan, South Korea
[7] Dept Informat Stat, Seoul, South Korea
[8] Inha Univ Hosp, Dept Occupat & Environm Med, Inchon, South Korea
[9] Kyung Hee Univ, Coll Med, Dept Occupat & Environm Med, Seoul, South Korea
[10] Yonsei Univ, Wonju Severance Christians Hosp, Dept Occupat & Environm Med, Wonju, South Korea
[11] Kangwon Natl Univ, Dept Prevent Med, Sch Med, Chunchon, South Korea
[12] Eulji Univ, Sch Med, Dept Prevent Med, Daejeon, South Korea
[13] Dept Social & Prevent Med, Suwon, South Korea
[14] Samsung Biomed Res Inst, Suwon, South Korea
[15] Dong A Univ, Sch Med, Dept Prevent Med, Busan, South Korea
[16] Sch Med, Dept Prevent Med, Wonkwang, South Korea
[17] Yeungnam Univ, Coll Med, Dept Prevent Med & Publ Hlth, Daegu, South Korea
[18] Chosun Univ, Sch Med, Dept Occupat & Environm Med, Gwangju, South Korea
[19] Korea Res Inst Chem Technol, Div Adv Mat, Daejeon, South Korea
[20] Natl Inst Environm, Dept Environm Epidemiol, Div Environm Hlth, Inchon, South Korea