1. First Department of Obstetrics and Gynecology, Centre of Postgraduate Medical Education, 01-004 Warsaw, Poland
2. Department of Medical Statistics, School of Public Health, Centre of Postgraduate Medical Education, 01-828 Warsaw, Poland
3. Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland
4. Department of Gynecological Surgery and Gynecological Oncology of Adults and Adolescents, Pomeranian Medical University, 70-111 Szczecin, Poland
5. Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, 70-111 Szczecin, Poland
6. Department Obstetrics and Gynecology, Pomeranian Medical University, 70-111 Szczecin, Poland
7. Clinic of Obstetrics and Gynaecology, Provincial Combined Hospital in Kielce, 25-736 Kielce, Poland
8. Department of Obstetrics, Medical University of Gdańsk, 80-210 Gdańsk, Poland
9. Department of Reproductive Health, Center of Postgraduate Medical Education, Centre of Postgraduate Medical Education, Żelazna 90 St., 01-004 Warsaw, Poland
10. Department of Gynecology, University Hospital Zürich, 8091 Zürich, Switzerland