1. Finnish Cancer Registry Institute for Statistical and Epidemiological Cancer Research Helsinki Finland
2. Faculty of Medicine and Health Technology (MET) Tampere University Tampere Finland
3. Department of Obstetrics and Gynecology Central Finland Central Hospital Jyväskylä Finland
4. Department of Obstetrics and Gynecology Tampere University Hospital Tampere Finland
5. Tays Cancer center Tampere University Hospital Tampere Finland
6. Department of Public Health School of Medicine University of Helsinki Helsinki Finland
7. Faculty of Social Sciences Tampere University Tampere Finland