[1] Chung Ang Univ, Coll Med, Seoul, South Korea
[2] Soonchunhyang Univ, Seoul Hosp, Pediat, Seoul, South Korea
[3] Chonnam Natl Univ Hosp, Pediat, Gwangju, South Korea
[4] Seoul Natl Univ Hosp, Pediat, Seoul, South Korea
[5] Pusan Natl Univ, Pediat, Yangsan Hosp, Yangsan, South Korea
[6] Seoul Natl Univ, Pediat, Coll Med, Seongnam, South Korea
[7] Catholic Univ Korea, Pediat, Sch Med, Bucheon, South Korea
[8] Hallym Univ, Pediat, Kangdong Sacred Heart Hosp, Seoul, South Korea
[9] Inje Univ, Pediat, Seoul Paik Hosp, Seoul, South Korea
[10] Korea Univ, Pediat, Anam Hosp, Seoul, South Korea
[11] Sungkyunkwan Univ, Precis Med, Sch Med, Suwon, South Korea
[12] Korea Univ, Pediat, Guro Hosp, Seoul, South Korea
[13] Asan Med Ctr, Childhood Asthma Atopy Ctr, Pediat, Seoul, South Korea