1. Department of Obstetrics and Gynaecology HUCH Hyvinkää Hospital Hyvinkää Finland
2. Department of Obstetrics and Gynaecology University of Helsinki Helsinki Finland
3. Department of Obstetrics and Gynaecology Helsinki University Hospital Helsinki Finland
4. Information Services Department THL Finnish Institute for Health and Welfare Helsinki Finland
5. Department of Neurobiology, Care Sciences and Society Division of Family Medicine Karolinska Institutet Stockholm Sweden
6. Finnish Cancer Registry Institute for Statistical and Epidemiological Cancer Research Helsinki Finland
7. Faculty of Social Sciences Tampere University Tampere Finland