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. 2021 Feb 17;16:34. doi: 10.1186/s13014-021-01759-9

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Forest plots comparing the risk of local recurrence between the adjuvant RT cohort and the observation cohort in subgroups using a 1993 or 2000 WHO criteria and b 2007 or 2016 WHO criteria for included studies. The benefit of adjuvant RT in local recurrence is significantly higher in a subgroup using the 2007 or 2016 WHO criteria