About the Authors

Inga-Maj Andersson

Inga-Maj.Andersson@ki.se

Affiliation Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm South General Hospital, Stockholm, Sweden

Kyllike Christensson

Affiliation Department of Women’s and Children’s Health, Division of Reproductive Health, Karolinska Institutet, Stockholm, Sweden

Kristina Gemzell-Danielsson

Affiliation Department of Women’s and Children’s Health, Division of Obstetrics and Gynecology, Karolinska Institutet, WHO-centre, Karolinska University Hospital, Stockholm, Sweden

Competing Interests

Professor Kristina Gemzell-Danielsson is an associate editor of PLOS ONE. The authors confirm that this does not alter their adherence to all PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: IMA KC KGD. Performed the experiments: IMA. Analyzed the data: IMA KC KGD. Contributed reagents/materials/analysis tools: IMA KC KGD. Contributed to the writing of the manuscript: IMA KC KGD.