[1] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Infect Dis, 388-1 Pungnap Dong, Seoul 138736, South Korea
[2] Chungbuk Natl Univ, Coll Med, Cheongju, South Korea
[3] Chungbuk Natl Univ, Med Res Inst, Cheongju, South Korea
[4] Asan Inst Life Sci, Biomed Res Ctr, Seoul, South Korea