1. Department of Obstetrics and Gynaecology; Kuopio University Hospital; Kuopio Finland
2. Department of Psychiatry; Kuopio University Hospital; Kuopio Finland
3. School of Medicine, University of Eastern Finland; Kuopio Finland
4. Fertility Clinic, Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
5. National Institute for Health and Welfare (THL); Helsinki Finland
6. Nordic School of Public Health; Gothenburg Sweden
7. Department of Epidemiology; Rollins School of Public Health; Emory University; Atlanta GA USA