[1] Sungkyunkwan Univ, Samsung Med Ctr, Dept Pediat, Sch Med, 81 Irwon Ro, Seoul 06351, South Korea
[2] Hallym Univ, Dept Pediat, Hangang Sacred Heart Hosp, Seoul, South Korea
[3] Samsung Med Ctr, Environm Hlth Ctr Atop Dis, Seoul, South Korea
[4] Hallym Univ, Sch Med, Dept Pediat, Dongtan Sacred Heart Hosp, Dongtan, Gyeonggi Do, South Korea
[5] Samsung Med Ctr, Stat & Data Ctr, Res Inst Future Med, Seoul, South Korea