[1] Ewha Womans Univ, Coll Pharm, Seoul 03760, South Korea
[2] Ewha Womans Univ, Dept Stat, Seoul 03760, South Korea
[3] Sungkyunkwan Univ, Kangbuk Samsung Hosp, Dept Internal Med, Div Hematol Oncol,Sch Med, Seoul 03063, South Korea
[4] Dongguk Univ, Dept Internal Med, Div Hematol Oncol, Ilsan Hosp, Seoul 10326, South Korea
[5] Chung Ang Univ Hosp, Dept Internal Med, Div Hematol Med Oncol, Seoul 06974, South Korea
[6] Dong A Univ, Dept Internal Med, Dong A Univ Hosp, Coll Med, Busan 49236, South Korea
[7] Catholic Univ Korea, Dept Internal Med, Div Oncol, Yeouido St Marys Hosp, Seoul 07345, South Korea
[8] Dept Pharmaceut Benefits Hlth Insurance Review &, Wonju 26465, South Korea
[9] Chungbuk Natl Univ, Coll Med, Dept Internal Med, Cheongju 28644, South Korea
[10] Inha Univ Hosp, Dept Internal Med, Div Hematol & Oncol, Incheon 400711, South Korea
[11] Catholic Univ Korea, Seoul St Marys Hosp, Med Oncol, Seoul 07345, South Korea