[1] Ewha Womans Univ, Mokdong Hosp, Dept Internal Med, Div Hematol Oncol, 1071 Anyangcheon Ro, Seoul 07985, South Korea
[2] Eulji Univ, Uijeongbu Eulji Med Ctr, Dept Internal Med, Daejeon, South Korea
[3] Catholic Univ Korea, Coll Med, Seoul St Marys Hosp, Dept Pediat, Seoul, South Korea
[4] Ajou Univ, Sch Med, Ajou Univ Hosp, Dept Pediat, Suwon, South Korea
[5] Seoul Natl Univ Hosp, Dept Internal Med, Seoul, South Korea
[6] Yonsei Univ, Coll Med, Severance Hosp, Dept Internal Med,Div Hematol, Seoul, South Korea
[7] Inje Univ, Busan Paik Hosp, Dept Internal Med, Busan, South Korea
[8] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Hematol Oncol, 81 Irwon Ro, Busan 06351, South Korea
[9] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Hematol, Seoul, South Korea
[10] Chonnam Natl Univ, Hwasun Hosp, Dept Pediat, Hwasun, South Korea