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. 2016 Nov 25;35:98. doi: 10.1186/s40880-016-0160-9

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© The Author(s) 2016

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. 2 — The calibration curve for predicting overall survival (OS) of patients with non-metastatic NPC in the internal validation set (a) and intensity-modulated radiation therapy (IMRT) cohort (b). The nomogram-predicted probability of OS is plotted on the x-axis; the actual OS is plotted on the y-axis