On pages 298 and 307 in the 14 July 2011 issue, the seventh author's name (Sarah Mercier) is incorrectly listed without the middle initial. The correct name is Sarah K. Mercier. In the “Authorship,” the initials “S.M.” should have been listed as “S.K.M.” The errors were corrected in the online version, which now differs from the print version.

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