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Additional Information

Competing Interests

The authors have no competing interests to declare.

Author Contributions

Sean A Rands conceived and designed the experiments, analyzed the data, wrote the paper.

Naomi Terry conceived and designed the experiments, performed the experiments, analyzed the data.

Hayley Muir conceived and designed the experiments, performed the experiments, analyzed the data.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The work described is purely observational, conforming with UK law and ASAB/ABS guidelines on animal experimentation. Ethical approval was given by the University of Bristol Ethical Review Group (University Investigation Number UB/12/035).

Funding

This work was unfunded.


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