O Vasilj1, R Matijevic2, V Blagaic2, B Miskovic2. 1. Department of Obstetrics and Gynaecology, Clinical Hospital Sveti Duh, Zagreb, Croatia. Electronic address: oliver.vasilj@gmail.com. 2. Department of Obstetrics and Gynaecology, Clinical Hospital Sveti Duh, Zagreb, Croatia.