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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Anny Aasprang 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.

John Roger Andersen 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.

Villy Våge reviewed drafts of the paper.

Ronette L Kolotkin reviewed drafts of the paper.

Gerd Karin Natvig conceived and designed the experiments, 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 study was approved by the Regional Committee of Etichs in Medicine, West-Norway (Reference number 2009/2174)

Funding

The study was financially supported by the Faculty of Health Studies, Sogn og Fjordane University College, Norway. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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