1. Department of Obstetrics and Gynecology, Kalmar County Hospital, Kalmar, Sweden
2. Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
3. Department of Obstetrics and Gynecology, Linköping University Hospital, Sweden
4. Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
5. Department of Obstetrics and Gynecology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden