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. 2018 Jul 17;13:130. doi: 10.1186/s13014-018-1073-3

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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 — a Overall survival (OS) curve for esophagus-sparing group and non-sparing group. The difference between two groups was not significant (Log-rank, P = 301) (b) Loco-regional failure free survival (LRFS) curve for esophagus-sparing group and non-sparing group. The difference between two groups was not significant (Log-rank, p = 0. 871)