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Additional Information

Competing Interests

Gavin Stewart is an Academic Editor for PeerJ. 

Author Contributions

Beth Clark conceived and designed the experiments, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Gavin B Stewart conceived and designed the experiments, reviewed drafts of the paper.

Luca A Panzone conceived and designed the experiments, reviewed drafts of the paper.

Lynn J Frewer conceived and designed the experiments, reviewed drafts of the paper.

Funding

This review was funded by the FP7 PROHEALTH EU project (number 613574). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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