[1] Nicolaus Copernicus Univ, Coll Med, Clin Fetal Maternal Gynecol & Neonatolgy, Bydgoszcz, Poland
[2] Poznan Univ Med Sci, Dept Obstet & Womens Dis, Poznan, Poland
[3] Jagiellonian Univ Med Coll, Dept Gynecol & Oncol, Chair Gynecol & Obstet, Krakow, Poland
[4] Med Univ Silesia, Dept Obstet & Gynecol Ruda Slaska, Katowice, Poland
[5] Chair Obstet, Dept Maternal Fetal Med & Gynecol, Bydgoszcz, Poland
[6] Wroclaw Med Univ, Dept Gynecol & Obstet 2, Wroclaw, Poland
[7] Jagiellonian Univ Med Coll, Dept Obstert & Perinatol, Krakow, Poland
[8] Poznan Univ Med Sci, Dept Obstet & Womens Dis, Poznan, Poland
[9] Inst Mother & Child Hlth, Clin Obstet & Gynecol, Warsaw, Poland
[10] Polish Mothers Mem Hosp Res Inst, Operat Gynecol & Oncol Gynecol Clin, Lodz, Poland
[11] Med Univ Warsaw, Chair & Dept Obstet & Gynecol 1, Warsaw, Poland
[12] Pomeranian Med Univ, Dept Obstet & Gynecol, Szczecin, Poland
[13] Univ Hosp, Dept Obstet & Perinatol, Krakow, Poland
[14] Poznan Univ Med Sci, Dept Perinatol & Gynecol, Poznan, Poland
[15] Med Univ Lodz, Dept Fetal Med & Gynecol, Lodz, Poland
[16] Med Univ Warsaw, Dept Obstet & Perinatol, Warsaw, Poland
[17] Jagiellonian Univ Med Coll, Dept Gynecol & Obstet, Fac Med, Krakow, Poland