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. 2017 Aug 11;7:7914. doi: 10.1038/s41598-017-08382-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The calibration plots of the nomogram of derivation and validation sets for 3- and 5-year survival predictions. The X-axis represents the nomogram-predicted survival and the Y-axis shows the mean survival and 95% confidence interval calculated by the Kaplan-Meier method. Patients were divided into quintiles (Q) to evaluate the accuracy of nomogram (Q1: ≤6, Q2: 6.1 to 12, Q3: 12.1 to 18, Q4: 18.1 to 24, Q5: >24). For patients from both derivation and validation sets, the calibration lines fit along with the 45-degree reference for both 3- and 5-year survival predictions except for patients nomogram point more than 24.