1. Department of Obstetrics and Gynecology Lapland Central Hospital Rovaniemi Finland
2. Department of Obstetrics and Gynecology Helsinki University Hospital Helsinki Finland
3. Helsinki University Helsinki Finland
4. Department of Obstetrics and Gynecology Turku University Hospital Turku Finland
5. Department of Obstetrics and Gynecology Oulu University Hospital Oulu Finland
6. Department of Obstetrics and Gynecology Kuopio University Hospital Kuopio Finland
7. Department of Obstetrics and Gynecology Tampere University Hospital Tampere Finland
8. Health Sciences Faculty of Social Sciences Tampere University Tampere Finland
9. Research, Development and Innovation Center Tampere University Hospital Tampere Finland