1. Department of Obstetrics and Gynecology, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
2. Medical Research Center, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
3. PEDEGO Research Unit, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
4. Center for Life Course Health Research, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
5. NordLab Oulu, Department of Clinical Chemistry, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
6. Institute of Reproductive and Developmental Biology, Imperial College London, London W12 ONN, United Kingdom
7. Center for Life Course Epidemiology, Faculty of Medicine, University Hospital of Oulu, University of Oulu, FI-90014 Oulu, Finland
8. Department of Epidemiology and Biostatistics, Medical Research Council-Public Health England Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, United Kingdom
9. Department of Obstetrics and Gynecology, University of Helsinki, Helsinki University Hospital, FI-00014 Helsinki, Finland
10. Faculty of Medicine, University of Oulu, FI-90014 Oulu, Finland