1. Department of Clinics of Obstetrics and Gynecology, Faculty of Medicine Vilnius University, Vilnius, Lithuania;
2. ‘Vaisingumo Klinika’, Vilnius, Lithuania;
3. Department of Anatomy, Histology and Anthropology, Faculty of Medicine Vilnius University, Vilnius, Lithuania;
4. Faculty of Medicine, Vilnius University, Vilnius, Lithuania