1. Department of Obstetrics and Gynecology, Helsinki University Hospital and University of Helsinki , Helsinki, Finland
2. Department of Obstetrics and Gynecology, Hyvinkää Hospital , Hyvinkää, Finland
3. Department of Obstetrics and Gynecology, Oulu University Hospital, Wellbeing Services County of North Ostrobothnia , Oulu, Finland
4. Research Unit of Clinical Medicine, University of Oulu , Oulu, Finland
5. Medical Research Center Oulu (MRC Oulu), University of Oulu, Oulu University Hospital, Wellbeing Services County of North Ostobothnia , Oulu, Finland
6. Department of Knowledge Brokers, Finnish Institute for Health and Welfare , Helsinki, Finland
7. Department of Molecular Medicine and Surgery, Karolinska Institute , Stockholm, Sweden
8. Academic Primary Health Care Center , Stockholm, Sweden
9. Department of Biostatistics, University of Helsinki , Helsinki, Finland