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. 2019 Sep 2;14:157. doi: 10.1186/s13014-019-1360-7

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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. 5 — Mean dose and standard error for different photons or proton plans and for all delineated organs at risk. P values were calculated for mean dose, comparing proton and photon planning approaches. P values were given if significance has been reached. (*➔p = < 0.05; **➔p < 0.01; ***➔p < 0.001)