1. Department of Obstetrics and Gynaecology Didactics, Medical University of Warsaw, Poland
2. Department of Obstetrics and Gynaecology, Wysokie Mazowieckie Hospital, Poland
3. Department of Obstetrics and Gynaecology, St Sophia Specialist Hospital, Warsaw, Poland
4. Department of Reproductive Health, Centre of Postgraduate Medical Education, Warsaw, Poland
5. Medical University of Warsaw, Poland