1. Department of Obstetrics and Gynecology, Oulu University Hospital, Wellbeing Services County of North Ostrobothnia, University of Oulu, 90220 Oulu, Finland
2. Research Unit of Clinical Medicine, University of Oulu, 90220 Oulu, Finland
3. Medical Research Center, Oulu University Hospital, Wellbeing Services County of North Ostrobothnia, University of Oulu, 90220 Oulu, Finland
4. Research Unit of Mathematical Sciences, Faculty of Science, University of Oulu, 90014 Oulu, Finland
5. Department of Public Health and Welfare, Finnish Institute for Health and Welfare, 00271 Helsinki, Finland
6. Institute of Clinical Medicine, University of Eastern Finland, 70029 Kuopio, Finland
7. Department of Oncology, University of Helsinki, Helsinki University Hospital Comprehensive Cancer Center, 00029 Helsinki, Finland
8. Department of Oncology and Radiotherapy, Tays Cancer Center, Tampere University Hospital, Faculty of Medicine and Health Technology, Tampere University, 33521 Tampere, Finland