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. 2019 Aug 27;19:162. doi: 10.1186/s12890-019-0926-3

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© The Author(s). 2019

Open Access This 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 — PCA was performed to evaluate the results of microbial culture from ETAs and ETTs. Ab:Acinetobacter baumannii; Kpn:Klebsiella pneumoniae; PA:Pseudomonas aeruginosa; SA:Staphylococcus aureus; NM:Normal microbiotas; T:Endotrcheal tube specimens ;A:Endotracheal aspirate specimens