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Additional Information

Competing Interests

The author declares that she has no competing finanical or other interests.

Author Contributions

Jennifer Arter 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.

Human Ethics

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

This research was approved by the Committee for Protection of Human Subjects of the University of California, Berkeley, CPHS #2010-3-1055, and was carried out in accordance with all ethical principles of the protection of human subjects. All participants were informed of their rights as research participants, and all gave written informed consent to participate.


This study was carried as part of dissertation work completed at the University of California, Berkeley, and thus was indirectly funded by that institution. No specific additional funding was provided for this project. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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