1. Department of Public Health (G.H., L.S., J.T.), University of Helsinki, FIN-00014 Helsinki, Finland
2. Departments of Health Promotion and Chronic Diseases Prevention (G.H., J.L., P.J., M.P., J.T.), National Public Health Institute, FIN-00300 Helsinki, Finland
3. Department of Obstetrics and Gynaecology (R.K.), Helsinki University Hospital, FIN-00290 Helsinki, Finland
4. Department of Health and Functional Capacity (J.S.), National Public Health Institute, FIN-00300 Helsinki, Finland
5. Department of South Ostrobothnia Central Hospital (J.T.), 60220 Seinäjoki, Finland