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. 2014 Jun 24;12:192. doi: 10.1186/1477-7819-12-192

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Copyright © 2014 Han et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), 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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Comparison of overall survival between groups A3 and B3. (a) Overall survival of patients with tumors larger than 3 cm was significantly improved after 2003 (P = 0.012). (b) The overall survival after recurrence in patients with tumors larger than 3 cm was significantly improved after 2003 (P = 0.002).