[1] Chungbuk Natl Univ, Coll Med, Pediat, Cheongju, South Korea
[2] Yeungnam Univ, Coll Med, Pediat, Daegu, South Korea
[3] Natl Canc Ctr, Pediat Oncol, Goyang, South Korea
[4] Kyungpook Natl Univ, Sch Med, Pediat, Daegu, South Korea
[5] Univ Ulsan, Coll Med, Ulsan Univ Hosp, Pediat, Ulsan, South Korea
[6] Hanyang Univ, Coll Med, Pediat, Seoul, South Korea
[7] Keimyung Univ, Coll Med, Pediat, Daegu, South Korea
[8] Korea Canc Ctr Hosp, Pediat, Seoul, South Korea
[9] Chungnam Natl Univ, Coll Med, Pediat, Daejon, South Korea
[10] Dong A Univ, Coll Med, Pediat, Busan, South Korea
[11] Inje Univ, Busan Paik Hosp, Pediat, Busan, South Korea
[12] Dankook Univ, Coll Med, Pediat, Cheonan, South Korea
[13] Inha Univ, Coll Med, Pediat, Incheon, South Korea
[14] Seoul Natl Univ, Bundang Hosp, Pediat, Seongnam, South Korea
[15] Seoul Natl Univ, Bundang Hosp, Canc Res Inst, Pediat, Seoul, South Korea