1. Section of Epidemiology Department of Public Health University of Copenhagen Copenhagen Denmark
2. Division of Clinical Epidemiology Department of Medicine Solna Karolinska Institutet Stockholm Sweden
3. Finnish Institute for Health and Welfare Helsinki Finland
4. Department of Neurobiology, Care Sciences and Society Karolinska Institutet Stockholm Sweden
5. Department of Global Public Health and Primary Care University of Bergen Bergen Norway
6. Division for Mental and Physical Health Norwegian Institute of Public Health Oslo Norway
7. Center for Fertility and Health Norwegian Institute of Public Health Oslo Norway
8. Department of Obstetric and Gynecology Hvidovre HospitalUniversity Hospital Copenhagen Copenhagen Denmark
9. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark