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Competing Interests

The authors' individual competing interests are at http://www.plosmedicine.org/static/editorsInterests.action. PLoS Medicine editors are paid a fixed salary (their salary is not linked to the number of papers published in the journal). PLoS Medicine's direct revenue from 2009 is as follows: Total income US$187,640.59 comprises US$ 179,220.00 in author fees, US$ 8339.81 of advertising and other revenue and US$ 80.78 in reprint revenues. PLoS's overall revenues for 2009 are listed in the 2009 Progress report http://www.plos.org/downloads/progress_update_lo.pdf.

Author Contributions

ICMJE criteria for authorship read and met: JC VB SJ EV. Agree with the manuscript's results and conclusions: JC VB SJ EV. Wrote the first draft of the paper: VB. Contributed to the writing of the paper: JC SJ EV.