1. Maternal-Fetal Medicine Unit, Department of Obstetrics and Gynecology, 1st Faculty of Medicine, Charles University and General Faculty Hospital in Prague, Prague, Czech Republic
2. Maternal-Fetal Medicine Unit, Department of Obstetrics and Gynecology, Cairo University, Cairo, Egypt
3. Biomedical center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
4. Department of Histology and Embryology, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
5. Department of Obstetrics and Gynecology, University Hospital, Pilsen, Czech Republic
6. Department of Gynecology and Obstetrics, Faculty of Medicine in Pilsen, Pilsen, Czech Republic