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Additional Information

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

David A Ellis 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.

Rob Jenkins conceived and designed the experiments, contributed reagents/materials/analysis tools, 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 University of Glasgow, College of Science & Engineering Ethics Committee approved all research (2013-4641). Participants were informed about procedures in detail and provided written informed consent.

Funding

This research was supported by an ESRC studentship to Ellis (ES/G017271/1), and an ESRC research grant to Jenkins (RES-060-25-0010), http://www.esrc.ac.uk/. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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