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. 2020 Aug 4;10:1222. doi: 10.3389/fonc.2020.01222

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Copyright © 2020 Sun, Wang, Wang, Kang, Jiang, Men and Hui.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Forest plot of hazard ratio (HR) of OS in comparison of LD-RT group to HD-RT group for SCC; Publication bias: Begg's test, P = 0.21; Egger's test, P = 0.56. (B) Forest plot of hazard ratio (HR) of OS in comparison of LD-RT subgroup (<circa 60 Gy) to HD-RT subgroup (≥circa 60 Gy) for SCC; Publication bias: Begg'stest, P = 0.051; Egger's test, P = 0.13. (C) Forest plot of hazard ratio (HR) of OS in comparison of LD-RT subgroup (>50.4 Gy) to HD-RT subgroup (>50.4 Gy) for SCC. CI, confidence interval; HD, high dose; LD, low dose; RT, radiotherapy.