[1] CHA Univ, Sch Med, Dept Internal Med, Songnam 463836, South Korea
[2] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Songnam, South Korea
[3] Chonnam Natl Univ, Sch Med, Dept Internal Med, Kwangju, South Korea
[4] Seoul Natl Univ, Dept Internal Med, Seoul, South Korea
[5] Kyung Hee Univ, Sch Med, Dept Hematol Oncol, Seoul, South Korea
[6] Inha Univ, Coll Med, Dept Internal Med, Inchon, South Korea