[1] Chung Ang Univ Hosp, Seoul, South Korea
[2] Gyeongsang Natl Univ Hosp, Jinju, South Korea
[3] Keimyung Univ, Sch Med, Dongsan Med Ctr, Daegu, South Korea
[4] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Oncol, Seoul, South Korea
[5] Chungnam Natl Univ, Dept Internal Med, Daejeon, South Korea
[6] Inje Univ, Ilsan Baik Hosp, Goyang, South Korea
[7] Inje Univ, Coll Med, Dept Internal Med, Sanggye Paik Hosp, Seoul, South Korea
[8] Hallym Univ, Dongtan Sacred Heart Hosp, Hwasung, South Korea
[9] Sungkyunkwan Univ, Sch Med, Dept Internal Med, Div Hematol Oncol,Samsung Med Ctr, Seoul, South Korea
[10] Sungkyunkwan Univ, Sch Med, Dept Med, Div Hematol Oncol,Samsung Med Ctr, Seoul, South Korea