[1] Seoul Natl Univ, Dept Pediat, Coll Med, 101 Daehak Ro, Seoul 03080, South Korea
[2] Seoul Natl Univ Hosp, Dept Emergency Med, Seoul, South Korea
[3] Dongguk Univ, Dept Pediat, Ilsan Hosp, Goyang, South Korea
[4] Seoul Natl Univ, Dept Anesthesiol & Pain Med, Coll Med, Seoul, South Korea
[5] Hanyang Univ, Coll Med, Dept Pediat, Med Ctr, Seoul, South Korea
[6] Seoul Natl Univ Hosp, Dept Nursing, Seoul, South Korea
[7] Pusan Natl Univ, Dept Emergency Med, Coll Med, Busan, South Korea
[8] Catholic Univ Korea, Dept Emergency Med, Coll Med, Seoul, South Korea
[9] Ajou Univ, Dept Emergency Med, Coll Med, Suwon, South Korea
[10] Childrens Hosp, Asan Med Ctr, Dept Pediat, Seoul, South Korea
[11] Ajou Univ Hosp, Dept Pediat, Suwon, South Korea
[12] SMG SNU Boramae Med Ctr, Dept Emergency Med, Seoul, South Korea
[13] Gachon Univ, Gil Med Ctr, Dept Emergency Med, Coll Med, Incheon, South Korea
[14] Yonsei Univ, Dept Emergency Med, Wonju Coll Med, Wonju, South Korea