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. 2020 Jan 27;10:1220. doi: 10.1038/s41598-020-58134-z

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© The Author(s) 2020

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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Statistical comparison of conformity index (CI) and homogeneity index (HI) for the PTV in four treatment plans. The midline shows the median; the box covers the 25th to the 75th percentile of the group; the whiskers depict the range of values for standard deviation; a square with or without black fill indicates the mean value. ^*Indicates a statistically significant difference. W-TF = 3D-CRT with two tangential fields and wedges; 2F-IMRT = IMRT with two tangential fields; 6F-IMRT = IMRT with six fields; and VMAT = VMAT with double partial arcs.