1. 1Department of Obstetrics and Gynecology, Oulu University Hospital, University of Oulu and Medical Research Center, and PEDEGO Research Unit (Research Unit for Pediatrics, Dermatology, Clinical Genetics, Obstetrics and Gynecology), Oulu, Finland
2. 2Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
3. 3Center for Life Course Health Research, University of Oulu, Oulu, Finland
4. 5Medical Research Center Oulu, Oulu University Hospital, University of Oulu, Oulu, Finland
5. 4Unit of General Practice, Oulu University Hospital, Oulu, Finland
6. 6Nordlab Oulu, Medical Research Center Oulu, Oulu University Hospital and Department of Clinical Chemistry, University of Oulu, Oulu, Finland