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Additional Information

Competing Interests

The authors declare they have no competing interests

Author Contributions

Robert Aunger conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Katie Greenland 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):

London School of Hygiene and Tropical Medicine Ethics Committee (approval number 5655)

Data Deposition

The following information was supplied regarding the deposition of related data:

UK data archive at the University of Essex

Funding

No funding was required for this study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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