1. Department of Gynecology and Obstetrics University of Helsinki and Helsinki University Hospital Helsinki Finland
2. Department of General Practice and Primary Health Care University of Helsinki and Helsinki University Hospital Helsinki Finland
3. Primary Health Care Unit Kuopio University Hospital Kuopio Finland
4. Folkhälsan Research Center Helsinki Finland
5. Finnish Institute for Health and Welfare (THL) Helsinki Finland
6. Karolinska Institute Stockholm Sweden
7. Vantaa Health Center Vantaa Finland
8. Department of Obstetrics & Gynecology Yong Loo Lin School of Medicine National University of Singapore Singapore
9. Singapore Institute for Clinical Sciences (SICS) Agency for Science, Technology and Research (A*STAR) Singapore