1. Women and Children's Division, Oslo University Hospital, Rikshospitalet, Oslo, Norway
2. University of Oslo, Faculty of Medicine, Oslo, Norway
3. Division of Obstetrics and Gynecology, Karolinska Institute and University Hospital, Huddinge, Stockholm, Sweden
4. Stockholm IVF, Stockholm, Sweden
5. Departments of Physiology and Pediatrics, University of Turku, Turku, Finland
6. Tampere University Central Hospital, Tampere, Finland
7. TYKSLAB, Turku University Central Hospital, Turku, Finland
8. Barts and the London, Queen Mary College, William Harvey Research Institute, Centre for Endocrinology, University of London, London, UK
9. Faculty of Veterinary Medicine and Biosciences, University of Oslo, Oslo, Norway
10. Helsinki University Central Hospital, Helsinki, Finland
11. University of Helsinki, Helsinki, Finland
12. Department of Women's and Children's Health, Karolinska Institute and University Hospital, Stockholm, Sweden