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. 2021 Jan 8;11:250. doi: 10.1038/s41598-020-78624-4

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© The Author(s) 2021

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 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/.

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Kaplan–Meier survival analysis of clinicopathological variables in OTSCC patients (a). Disease free survival by clinical stage (b). Overall survival by clinical stage (c). Disease free survival by neck node status (d). Overall survival by neck node status (e). Disease free survival by occult node status (f). Overall survival by occult node status (g). Overall survival by habits status (h). Disease free survival by Perineural invasion in early stage OTSCC treated by surgery. P values correspond to the log-rank test comparing the survival curves.