Research Unit, Department of Obstetrics and Gynecology, University Medical Centre Ljubljana, Šlajmarjeva 3, Ljubljana, Slovenia. University of Ljubljana, Faculty of Pharmacy, Aškerčeva 7, Ljubljana, Slovenia. Krka, d.d., Novo mesto, Šmarješka 6, Novo mesto, Slovenia. University of Ljubljana, Faculty of Pharmacy, Aškerčeva 7, Ljubljana, Slovenia. marija.sollner@ffa.uni-lj.si.