1. Fertility Clinic; Copenhagen University Hospital; Hvidovre Hospital; Copenhagen Denmark
2. Fertility Clinic; Section 4071; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
3. Reproductive Medicine; Departments of Obstetrics and Gynaecology; Institute of Clinical Sciences; Sahlgrenska Academy; Gothenburg University; Sahlgrenska University Hospital; Gothenburg Sweden
4. Departments of Obstetrics and Gynaecology; Institute of Clinical Sciences; Sahlgrenska Academy; Gothenburg University; Sahlgrenska University Hospital/East; Gothenburg Sweden
5. Väestöliitto Fertility Clinic; Helsinki Finland
6. Department of Obstetrics and Gynaecology; IVF Unit; St Olav's University Hospital; Trondheim Norway
7. Department of Public Health; Norwegian University of Science and Technology; Trondheim Norway
8. Department of Medical Genetics; Helsinki University Central Hospital (HUCH) and University of Helsinki; Helsinki Finland
9. Section for Reproductive Medicine; Department of Gynecology; Oslo University Hospital; Oslo Norway
10. Section of Biostatistics; Department of Public Health; University of Copenhagen; Copenhagen Denmark
11. Fertility Clinic; Copenhagen University Hospital; Hvidovre Denmark