[1] Oita Univ, Dept Microbiol, Sch Med, Oita 87011, Japan
[2] Gazi Univ, Dept Med Microbiol, Fac Med, Ankara, Turkey
[3] Gazi Univ, Fac Med, Dept Pediat Gastroenterol, Ankara, Turkey
[4] Ankara Training & Educ Hosp, Dept Pediat, Minist Hlth, Ankara, Turkey
[5] Oita Univ, Div Infect Dis, Dept Social & Environm Med, Inst Sci Res, Oita 87011, Japan