[1] Univ Med Sci, Fac Med, Dept Infectuous Deseases, PL-61285 Poznan, Poland
[2] Univ Med Sci, Fac Med, Dept Infectuous Dis & Child Neurol, PL-61285 Poznan, Poland
[3] Univ Med Sci, Dept Prevent Med, PL-61285 Poznan, Poland
[4] John Paul 2 Hosp, Dept Childrens Infect Deseases, Krakow, Poland
[5] Nicolaus Copernicus Univ, Coll Med, Dept Infect Deseases & Hepatol, Bydgoszcz, Poland
[6] Specialist Reg Ctr Mother & Child Hlth Care, Poznan, Poland
[7] Voivodship Hosp Infect Deseases & Observat, Torun, Poland
[8] Natl Res Inst Mother & Child, Warsaw, Poland