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. 2009 Apr 17;4(4):e5260. doi: 10.1371/journal.pone.0005260

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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The selected states are the two with the highest correlations between CDC sentinel provider data and call data (California and Wisconsin), the two with the lowest correlations (Arizona and New Jersey), and the two in the middle of the range (Missouri and Ohio).