[1] Sungkyunkwan Univ, Samsung Med Ctr, Dept Med, Div Hematol Oncol,Sch Med, Seoul, South Korea
[2] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Internal Med,Div Oncol, Seoul, South Korea
[3] Yonsei Univ, Coll Med, Yonsei Canc Ctr, Seoul 120749, South Korea
[4] Korea Univ, Med Ctr, Anam Hosp, Dept Internal Med,Div Hematol Oncol, Seoul 136701, South Korea
[5] Hanyang Univ, Dept Internal Med, Hematol Oncol Sect, Seoul 133791, South Korea
[6] Ajou Univ, Dept Hematol Oncol, Sch Med, Suwon 441749, South Korea
[7] Gyeongsang Natl Univ, Coll Med, Dept Internal Med, Jinju, South Korea