[1] Med Univ Lublin, Fac Hlth Sci, Lublin, Poland
[2] Univ Luxembourg, Fac Sci Technol & Med, Dept Life Sci & Med, 2 Ave Fonte, L-4365 Esch Sur Alzette, Luxembourg
[3] Vrije Univ Brussel, Dept Publ Hlth, Biostat & Med Informat Res Grp, Brussels, Belgium
[4] Med Univ Warsaw, Fac Hlth Sci, Dept Obstet & Gynecol Didact, Warsaw, Poland
[5] Univ Clin Hosp Poznan, Poznan, Poland
[6] Poznan Univ Med Sci, Dept Mother & Child Hlth, Poznan, Poland