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Supplemental Information

Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Pierre-Cedric Crouch 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.

Carol PhD, RN, FAAN Dawson Rose wrote the paper, reviewed drafts of the paper.

Mallory I. Johnson contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Susan Janson wrote the paper, 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 study was approved by the Committees on Human Research at the University of California, San Francisco. Approval number 12-08729

Funding

The authors declare there was no funding for this work.


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