In 'Open-access policy flourishes at NIH' ( Nature 458, 690; 2009), the number of articles downloaded from PubMed Central represent the average usage on a typical weekday, not a monthly total as we stated.
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The online version of the original article can be found at 10.1038/458690a
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Correction. Nature 458, 819 (2009). https://doi.org/10.1038/458819g
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DOI: https://doi.org/10.1038/458819g
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