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. 2011 Jan 6;6(1):e15700. doi: 10.1371/journal.pone.0015700

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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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Bacteria isolated from smokers were grown for 4 days in the absence of tobacco smoke, before a single sham or smoke exposure (5 cigarettes/3 h) and subsequent biofilm detection assay. Indicate the number of replicates, and repeat the significance test performed, and the p values.