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Additional Information

Competing Interests

The authors declare that there are no competing interests.

Author Contributions

Tunde Paal conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Thomas Carpenter conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Daniel Nettle conceived and designed the experiments, analyzed the data, 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 study was authorised by the Newcastle University Faculty of Medical Sciences Ethics Committee under approval number 00655/2013.

Funding

This research was supported by the Graduate School of the Faculty of Medical Sciences, Newcastle University. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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