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. 2015 Mar 31;15:30. doi: 10.1186/s12890-015-0020-4

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© Obstoy et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Histological analysis on hematoxylin-eosin-safran (HES) stained slides: A/ normal epithelium (X2), B/ hyperplasia (X10), C/ mild dysplasia (X10), D/ moderate dysplasia (X10), E/ severe dysplasia (X10), F/ microinvasive carcinoma (X20).