1. Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
2. Department of Community Medicine and Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
3. Epidemiology Branch, National Institute of Environmental Health Sciences, Durham, NC, USA
4. Division for Mental and Physical Health, Norwegian Institute of Public Health, Oslo, Norway
5. Department of Obstetrics and Gynecology, McGill University, Montreal, QC, Canada
6. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada