1. Department of Obstetrics and Gynecology, Turku University Hospital, University of Turku , Turku , Finland
2. Department of Obstetrics and Gynecology, Vaasa Central Hospital , Vaasa , Finland
3. Research, Development and Innovation Center, Tampere University Hospital , Tampere , Finland
4. Health Sciences, Faculty of Social Sciences, Tampere University , Tampere , Finland
5. Faculty of Dental Medicine and Oral Health Sciences, McGill University , Montreal, Quebec , Canada
6. Department of Oral Pathology and Radiology, University of Turku , Turku , Finland
7. Department of Pathology, Turku University Hospital , Turku , Finland
8. Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Technology , Tampere University, Tampere , Finland
9. Department of Obstetrics and Gynaecology, Tampere University Hospital , Tampere , Finland