[1] Niigata Univ, Dept Resp Med & Infect Dis, Grad Sch Med & Dent Sci, 1-757 Asahimachi dori,Chuo ku, Niigata, Niigata 9528510, Japan
[2] Oita Univ, Resp Med & Infect Dis, Fac Med, 1-1 Idaigaoka, Yufu, Oita 8795593, Japan
[3] Jikei Univ, Kashiwa Hosp, Dept Resp Med, Sch Med, 1-163-1 Kashiwabuka, Kashiwa, Chiba 2778567, Japan
[4] Oita Univ, Res Ctr GLOBAL & LOCAL Infect Dis, Fac Med, 1-1 Idaigaoka, Yufu, Oita 8795593, Japan
[5] Hiroshima Univ, Grad Sch Biomed & Hlth Sci, Dept Emergency & Crit Care Med, 1-2-3 Kasumi,Minami ku, Hiroshima, Hiroshima 7348553, Japan
[6] Niigata Univ, Dept Resp Med & Infect Dis, Grad Sch Med & Dent Sci, 1Asahimachi dori,Chuo ku, Niigata 951, Japan