[1] Minist Interior & Adm, Dept Obstet Womens Dis & Oncogynecol, Natl Inst Med, Woloska 137, PL-02507 Warsaw, Poland
[2] Inst Mother & Child Hlth, Dept Obstet & Gynecol, Kasprzaka 17a, PL-01211 Warsaw, Poland
[3] Jagiellonian Univ Med Coll, Chair Epidemiol & Prevent Med, Dept Epidemiol, 7 Kopern St, PL-31034 Krakow, Poland
[4] Inst Mother & Child Hlth, Ctr Reprod Hlth, Kasprzaka 17a, PL-01211 Warsaw, Poland