[1] Korea Univ, Coll Med, Dept Pediat, Seoul, South Korea
[2] Korea Univ, Anam Hosp, Environm Hlth Ctr Childhood Asthma, Seoul, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Internal Med, Seoul, South Korea
[4] Kangwon Natl Univ, Sch Med, Dept Internal Med, Chunchon, South Korea
[5] St Carollo Gen Hosp, Dept Internal Med, Sunchon, South Korea
[6] CHA Univ, CHA Bundang Med Ctr, Dept Pulmonol Allergy & Crit Care Med, Seongnam, South Korea
[7] Inje Univ, Coll Med, Busan Paik Hosp, Dept Internal Med, Busan, South Korea
[8] Ewha Womans Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[9] Yonsei Univ, Wonju Coll Med, Dept Internal Med, Wonju, South Korea
[10] Hanyang Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[11] Seoul Natl Univ Hosp, Dept Family Med, Seoul, South Korea
[12] Gachon Univ, Gil Med Ctr, Dept Otorhinolaryngol, Incheon, South Korea
[13] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Bundang, South Korea
[14] Kangwon Natl Univ, Sch Med, Dept Pediat, Chunchon, South Korea
[15] Hallym Univ, Sacred Heart Hosp, Coll Med, Dept Med, Anyang, South Korea
[16] Korea Univ, Coll Med, Dept Prevent Med, Inst Evidence Based Med Cochrane Korea, Seoul, South Korea
[17] Inje Univ, Sanggye Paik Hosp, Dept Pediat, Seoul, South Korea
[18] Yonsei Univ, Coll Med, Dept Internal Med, Div Allergy & Immunol, Seoul, South Korea
[19] Woori Pediat Clin, Goyang, South Korea
[20] Sungkyunkwan Univ, Sch Med, Dept Med, Seoul, South Korea
[21] Pusan Natl Univ, Yangsan Hosp, Resp & Allergy Clin, Yangsan, South Korea
[22] GF Internal Med Allergy Clin, Seoul, South Korea
[23] Hallym Univ, Kangnam Sacred Heart Hosp, Dept Pediat, Seoul, South Korea
[24] Armed Forces Capital Hosp, Dept Internal Med, Seongnam, South Korea
[25] Hallym Univ, Dongtan Sacred Heart Hosp, Dept Pediat, Dongtan, South Korea
[26] Pusan Natl Univ, Sch Med, Dept Internal Med, Busan, South Korea
[27] Dankook Univ, Coll Med, Dept Internal Med, Cheonan, South Korea
[28] Yeungnam Univ, Coll Med, Dept Internal Med, Daegu, South Korea
[29] Kyung Hee Univ, Sch Med, Dept Pediat, Seoul, South Korea
[30] Korea Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[31] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[32] Eulji Univ, Sch Med, Eulji Hosp, Dept Internal Med, Seoul, South Korea
[33] Inha Univ, Sch Med, Dept Pediat, Incheon, South Korea
[34] Inha Univ Hosp, Environm Hlth Ctr Allerg Dis, Incheon, South Korea