[1] Charles Univ Prague, Med Fac 3, Dept Obstet & Gynaecol, Ruska 84, Prague 10034 10, Czech Republic
[2] Charles Univ Prague, Dept Pathol, Med Fac 3, Prague, Czech Republic
[3] Charles Univ Prague, Dept Radiol, Med Fac 3, Prague, Czech Republic
[4] Charles Univ Prague, Fac Med Plzen, Dept Obstet & Gynaecol, Prague, Czech Republic