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. 2019 May 24;14:85. doi: 10.1186/s13014-019-1283-3

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© The Author(s). 2019

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. 1 — Kaplan-Meier curve demonstrating overall survival and progression-free survival according to a all patients, b lung V20, and c lung V5 groups. V_x was defined as the percentage of the total organ volume receiving a radiation dose of x (Gy) or more