About the Authors

Elisabeth Birkeland

Affiliation Dpt. Clinical Science, University of Bergen, Bergen, Norway

Guro Stokke

Affiliation Dpt. Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway

Randi J. Tangvik

Affiliation Dpt. Research and Development, Haukeland University Hospital, Bergen, Norway

Erik A. Torkildsen

Affiliation Dpt. Obstetrics and Gynecology, Stavanger University Hospital, Stavanger, Norway

Jane Boateng

Affiliation Dpt. Obstetrics and Gynecology, Helse-Foerde, Foerde, Norway

Anne L. Wollen

Affiliation Dpt. Bergen, Volvat Medical Centre, Bergen, Norway

Susanne Albrechtsen

Affiliations Dpt. Clinical Science, University of Bergen, Bergen, Norway, Dpt. Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway

Hans Flaatten

Affiliations Dpt. Anesthesia and Intensive Care, Haukeland University Hospital, Bergen, Norway, Dpt. Clinical Medicine, University of Bergen, Bergen, Norway

Jone Trovik

jone.trovik @helse-bergen.no

Affiliation Dpt. Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway

Competing Interests

The authors have declared that no competing interest exist.

Author Contributions

Conceived and designed the experiments: EB HF JT. Performed the experiments: EB GS RJT HF JT. Analyzed the data: EB GS RJT HF JT. Contributed reagents/materials/analysis tools: EB GS RJT EAT JB ALW SA HF JT. Wrote the paper: EB GS RJT EAT JB ALW SA HF JT.