1. Department of Obstetrics and Gynecology, Oulu University Hospital and University of Oulu, Oulu, Finland
2. PEDEGO Research Group, University of Oulu, Oulu, Finland
3. Department of Cardiology, Oulu University Hospital, Oulu, Finland
4. Department of Obstetrics and Gynecology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
5. Department of Obstetrics and Gynecology, Turku University Hospital and University of Turku, Turku, Finland