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1 Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway. Electronic address: marte.jettestad@helse-bergen.no.
2 Department of Obstetrics and Gynecology, Vestfold Hospital Trust, Tønsberg, Norway.
3 Department of Obstetrics and Gynecology, Oslo University Hospital, Oslo, Norway.
4 Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway; Department of Clinical Science, University of Bergen, Bergen, Norway.
1 Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway. Electronic address: marte.jettestad@helse-bergen.no.
2 Department of Obstetrics and Gynecology, Vestfold Hospital Trust, Tønsberg, Norway.
3 Department of Obstetrics and Gynecology, Oslo University Hospital, Oslo, Norway.
4 Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway; Department of Clinical Science, University of Bergen, Bergen, Norway.