1. Department of Obstetrics and Gynaecology, Oulu University Hospital and University of Oulu, Oulu, Finland
2. Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway
3. Center for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
4. Spiren Fertility Clinic, Trondheim, Norway
5. Department of Obstetrics and Gynaecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden
6. The Fertility Clinic, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
7. Information Services Department, THL, Finnish Institute for Health and Welfare, Helsinki, Finland
8. Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
9. Department of Obstetrics and Gynaecology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland