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. 2019 Nov 21;19:235. doi: 10.1186/s12886-019-1237-4

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© The Author(s). 2019

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. 2 — Pathologic sections revealed mild-looking squamous epithelia; the submucosa revealed fibrosis and focal neutrophilic cells infiltration. Squamous hyperplasia was noted while cellular atypia was absent. Left picture: low-power field. Right picture: high-power field