[1] Natl Canc Ctr, Ctr Pediat Hematol Oncol, Dept Pediat, Goyang, Gyeonggi, South Korea
[2] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Pediat, Seoul, South Korea
[3] Dankook Univ, Coll Med, Dept Pediat, Cheonan, South Korea
[4] Univ Ulsan, Coll Med, Ulsan Univ Hosp, Dept Pediat, Ulsan 680749, South Korea
[5] Ye Pediat Clin, Seoul, South Korea