1. Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
2. Institute of Clinical Medicine, Department of Obstetrics and Gynaecology, University of Tartu, L. Puusepa 8, 50406 Tartu, Estonia
3. Institute of Biomedicine and Translational Medicine, Department of Biomedicine, University of Tartu, Ravila 19, 50411 Tartu, Estonia
4. Department of Zoology, University of Tartu, Vanemuise 46, 51003 Tartu, Estonia
5. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 2, 00014 Helsinki, Finland
6. Department of Biology, University of Turku, Turun yliopisto, 20014 Turku, Finland
7. Department of Obstetrics and Gynecology, University Hospital of Oulu, University of Oulu, Medical Research Center Oulu and PEDEGO Research Unit, P.O BOX 23, FI-90029 OYS Oulu, Finland