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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Jorunn Drageset conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Elin Dysvik conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Birgitte Espehaug analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Gerd Karin Natvig conceived and designed the experiments, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Bodil Furnes conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The project involved a sample collected during 2009–2010. We obtained informed consent. The Western Norway Regional Committee for Medical and Health Research Ethics and the Norwegian Social Science Data Services approved the study (REK.Vest nr. 62.03/2009/1550).

Funding

Bergen University College and the University of Bergen supported this research. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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