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. 2015 Feb 28;13:86. doi: 10.1186/s12957-015-0493-x

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© Xu 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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Overall survival curves of the subgroups according to Figure 1 . There was no significant difference between group A, group B, and group C (P = 0.675). There was no significant difference between group D and group E (P = 0.383).