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. 2015 Apr 2;10:17. doi: 10.1186/s13000-015-0249-5

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© Hamanaka 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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Recurrence-free survival according to the number of invaded blood vessels. A) Comparison of 0 v (n = 274), 1v (n = 24), and ≥2 v (n = 37) cases. B) Comparison between 0 v + 1 v (n = 298) and ≥2 v (n = 37) cases.