[1] Oita Univ, Sch Med, Dept Microbiol, Oita, Japan
[2] Gazi Univ, Fac Med, Dept Med Microbiol, Ankara, Turkey
[3] Gazi Univ, Fac Med, Dept Pediat Gastroenterol, Ankara, Turkey
[4] Ankara Training & Educ Hosp, Minist Hlth, Dept Pediat, Ankara, Turkey
[5] Oita Univ, Inst Sci Res, Dept Social & Environm Med, Div Infect Dis, Oita, Japan