1. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, and Kätilöopisto Maternity Hospital, Helsinki, Finland
2. Department of Obstetrics and Gynecology, South Karelia Central Hospital, Lappeenranta, Finland
3. Medical Genetics and Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
4. University of Eastern Finland, Department of Health and Social Management, Research Centre for Comparative Effectiveness and Patient Safety, Kuopio, Finland
5. Helsinki and Uusimaa Hospital District, Helsinki, Finland
6. Kuopio University Hospital, Kuopio, Finland
7. Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
8. Division of Nutrition, Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
9. Turku University Hospital and Turku University, Turku, Finland
10. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Jorvi Hospital, Espoo, Finland
11. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Women's Hospital, Helsinki, Finland
12. Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
13. Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland
14. Department of General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
15. Folkhälsan Research Centre, Helsinki, University of Helsinki, Helsinki, Finland
16. Department of General Practice and Primary Health Care, University of Eastern Finland, Kuopio, Finland