1. Department of Obstetrics and Gynecology (F.P., T.M., A.-L.H., M.V., E.S.), Oulu University and Oulu University Hospital, Oulu 90029, Finland
2. Institute of Health Sciences (F.P., M.-R.J.), Oulu University, Oulu 90029, Finland
3. National Institute for Health and Welfare (F.P., H.-M.S., A.B., A.P., M.-R.J.), Department of Children, Young People, and Families, Oulu 90101, Finland
4. Department of Clinical Chemistry (T.M., A.R.), Oulu University and Oulu University Hospital, Oulu 90029, Finland
5. Department of Epidemiology and Biostatistics (M.-R.J.), Imperial College London, London SW7 2AZ, United Kingdom