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. 2018 Apr 10;19:58. doi: 10.1186/s12931-018-0766-3

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Mean serum cotinine concentration (n = 8) of rats at 1 h after daily smoke exposure during the CSE period (1 and 2 Month). CSE, cigarette smoke exposure; ^***P < 0.001 vs. control. ^†††P < 0.001 difference between CSE 1 M and CSE 2 M. Data was analyzed using SPSS by t-test