[1] Univ Ulsan, Coll Med, Childhood Asthma Atopy Ctr, Dept Pediat,Asan Med Ctr, Seoul 138736, South Korea
[2] Univ Ulsan, Coll Med, Res Ctr Standardizat Allerg Dis, Dept Pediat,Asan Med Ctr, Seoul 138736, South Korea
[3] Seoul Natl Univ, Coll Med, Bundang Hosp, Dept Pediat, Songnam, South Korea
[4] Inje Univ, Coll Med, Hae Undae Paik Hosp, Dept Pediat, Pusan, South Korea
[5] Inje Univ, Coll Med, Sanggye Paik Hosp, Dept Pediat, Pusan, South Korea
[6] Hallym Univ, Sacred Heart Hosp, Dept Pediat, Anyang, South Korea
[7] Ilsan Hosp, Natl Hlth Insurance Corp, Dept Pediat, Goyang, South Korea
[8] Korea Univ, Guro Hosp, Dept Pediat, Seoul, South Korea
[9] Inje Univ, Coll Med, Seoul Paik Hosp, Dept Pediat, Seoul, South Korea
[10] Sungkyunkwan Univ, Coll Med, Kangbuk Samsung Hosp, Dept Pediat, Seoul, South Korea
[11] Univ Ulsan, Coll Med, Seoul 138736, South Korea
[12] Asan Med Ctr, Asan Inst Life Sci, Seoul, South Korea