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Competing Interests

The authors' individual competing interests are at http://www.plosmedicine.org/static/editorsInterests.action. PLOS is funded partly through manuscript publication charges, but the PLOS Medicine Editors are paid a fixed salary (their salary is not linked to the number of papers published in the journal).

Author Contributions

Wrote the first draft of the manuscript: EV. Contributed to the writing of the manuscript: VB JC PS MW LC AR. ICMJE criteria for authorship read and met: VB JC PS MW LC AR. Agree with manuscript results and conclusions: VB JC PS MW LC AR.