1. Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
2. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland;
3. Children’s Hospital, Pediatric Research Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
4. THL National Institute for Health and Welfare, Helsinki, Finland and Karolinska Institute, Department of Neurobiology, Care Sciences and Society, Division of Family Medicine, Stockholm, Sweden;
5. Faculty of Social Sciences, University of Tampere, Tampere, Finland