1. Department of Gynecology University Zürich Zürich Switzerland
2. I‐st Department of Obstetrics and Gynecology Centre of Postgraduate Medical Education Warsaw Poland
3. Department of Medical Statistics School of Public Health Centre of Postgraduate Medical Education Warsaw Poland
4. Medical University of Bialystok Białystok Poland
5. Faculty of Medicine Lazarski University Warsaw Poland
6. Department of Reproductive Health Centre of Postgraduate Medical Education Warsaw Poland
7. Department of Midwifery Centre of Postgraduate Medical Education Warsaw Poland