[1] Chonnam Natl Univ, Chonnam Natl Univ Hosp, Dept Pediat, Med Sch, Gwangju, South Korea
[2] Soonchunhyang Univ, Dept Pediat, Pediat Allergy & Resp Ctr, Coll Med, Seoul, South Korea
[3] Univ Ulsan, Dept Pediat, Childhood Asthma Atopy Ctr, Asan Med Ctr,Coll Med, Seoul, South Korea
[4] Seoul Natl Univ, Dept Pediat, Coll Med, Seoul, South Korea
[5] Catholic Univ Korea, Bucheon St Marys Hosp, Dept Pediat, Coll Med, Seoul, South Korea
[6] Inje Univ, Dept Pediat, Seoul Paik Hosp, Seoul, South Korea
[7] Korea Univ, Dept Pediat, Guro Hosp, Seoul, South Korea
[8] Korea Univ, Dept Pediat, Anam Hosp, Seoul, South Korea
[9] Pusan Natl Univ, Dept Pediat, Yangsan Hosp, Yangsan, South Korea
[10] Chung Ang Univ, Coll Med, Chung Ang Univ Gwang Myeong Hosp, Dept Pediat, Gwangmyeong, South Korea
[11] Inha Univ, Coll Med, Dept Pediat, Incheon, South Korea
[12] Hallym Univ, Dept Pediat, Kangdong Sacred Heart Hosp, Seoul, South Korea
[13] Soonchunhyang Univ, Sch Med, Dept Pediat, Bucheon, South Korea
[14] Natl Hlth Insurance Serv Ilsan Hosp, Dept Pediat, Ilsan, South Korea
[15] Dankook Univ Hosp, Dept Pediat, Cheonan, South Korea
[16] Chungbuk Natl Univ, Coll Med, Dept Pediat, Cheongju, South Korea
[17] Catholic Univ Korea, Yeouido St Marys Hosp, Dept Pediat, Seoul, South Korea
[18] Sungkyunkwan Univ, Samsung Changwon Hosp, Dept Pediat, Sch Med, Chang Won, South Korea
[19] Sungkyunkwan Univ, Dept Precis Med, Sch Med, Suwon 16419, South Korea