1. Division for Mental and Physical Health, Norwegian Institute of Public Health, P.O. Box 4404 Nydalen, N-0403 Oslo, Norway
2. MRC Integrative Epidemiology Unit at the University of Bristol, Oakfield House, Oakfield Grove, BS8 2BN Bristol, UK
3. School of Social and Community Medicine, University of Bristol, Oakfield House, Oakfield Grove, BS8 2BN Bristol, UK
4. Department of Global Public Health and Primary Care, University of Bergen, P.O. Box 7804, N-5020 Bergen, Norway
5. Department of Clinical Science, University of Bergen, P.O. Box 7804, N-5020 Bergen, Norway
6. Centre for Fertility and Health (CeFH), Centre of Excellence at Norwegian Institute of Public Health, P.O. Box 4404 Nydalen, N-0403 Oslo, Norway
7. Institute for Health and Society, University of Oslo, P.O. Box 1130 Blindern, N-0403 Oslo, Norway
8. Department of Obstetrics and Gynaecology, IVF Unit, St Olav's University Hospital, P.O. Box 3250 Sluppen, N- 7006 Trondheim, Norway
9. Department of Public Health and Nursing, Norwegian University of Science and Technology, P.O. Box 8905, N-7491 Trondheim, Norway
10. Division for Health Data and Digitalization, Norwegian Institute of Public Health, P.O. Box 4404 Nydalen, N-0403 Oslo, Norway
11. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina NC 27709, USA