[1] Chonnam Natl Univ, Chonnam Natl Univ Hosp, Med Sch, Dept Pediat, Gwangju, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Pediat, Seoul, South Korea
[3] Hallym Univ, Dongtan Sacred Heart Hosp, Dept Pediat, Hwaseong, South Korea
[4] Yonsei Univ, Severance Hosp, Dept Pediat, Coll Med, Seoul, South Korea
[5] Soonchunhyang Univ, Coll Med, Pediat Allergy & Resp Ctr, Dept Pediat,Seoul Hosp, Seoul, South Korea
[6] Busan St Marys Hosp, Dept Pediat, Busan, South Korea
[7] Catholic Kwandong Univ, Int St Marys Hosp, Dept Pediat, Incheon, South Korea
[8] Catholic Univ Korea, Coll Med, Dept Pediat, Seoul, South Korea
[9] Yonsei Univ, Coll Med, Dept Pediat, Seoul, South Korea
[10] Chungbuk Natl Univ, Chungbuk Natl Univ Hosp, Coll Med, Dept Pediat, Cheongju, South Korea
[11] Yonsei Univ, Yongin Severance Hosp, Coll Med, Dept Pediat, Yongin, South Korea
[12] Pusan Natl Univ, Yangsan Hosp, Dept Pediat, Yangsan, South Korea
[13] Ilsan Hosp, Dept Pediat, Natl Hlth Insurance Serv, 100 Baekseok Ro, Ilsan 10444, South Korea