[1] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Songnam, South Korea
[2] Korea Ctr Dis Control & Prevent, Natl Inst Hlth, Ctr Infect Dis, Div Antimicrobial Resistance, Osong, South Korea
[3] Chonnam Natl Univ, Dept Internal Med, Sch Med, Kwangju, South Korea
[4] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul 151, South Korea
[5] Seoul Natl Univ, Coll Med, Dept Lab Med, Seoul, South Korea