1. Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
2. Department of Obstetrics and Gynecology, “Filippo Del Ponte” Hospital, University of Insubria, Varese, Italy
3. Department of Perinatology, Division of Gynaecology and Obstetrics, University Medical Centre Ljubljana, Ljubljana, Slovenia
4. Department of Human reproduction, Division of Gynaecology and Obstetrics, University Medical Centre Ljubljana, Ljubljana, Slovenia