1. Department of Environmental and Biological Sciences; University of Eastern Finland; Kuopio Finland
2. Department of Obstetrics and Gynaecology; Kuopio University Hospital; Kuopio Finland
3. Department of Health Sciences; Clinical Medicine; University of Eastern Finland; Kuopio Finland
4. Department of Health Protection; National Institute for Health and Welfare; Kuopio Finland
5. Department of Public Health; University of Helsinki; Helsinki Finland