1. Faculty of Health Sciences, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
2. Department of Nursing Science, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
3. Science Service Center, Kuopio University Hospital, Kuopio, Finland
4. Information Services Department, National Institute for Health and Welfare (THL), Helsinki, Finland
5. Division of Family Medicine, Department of Neurobiology, Care Sciences and Society, Karolinska Institute, Stockholm, Sweden
6. Department of Obstetrics and Gynaecology, University of Helsinki, Helsinki, Finland
7. Department of Obstetrics and Gynaecology, Helsinki University Central Hospital, Helsinki, Finland
8. Finnish Institute of Occupational Health, Helsinki, Finland