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. 2021 Feb 18;10:623818. doi: 10.3389/fonc.2020.623818

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Copyright © 2021 Qu, Liu, Jiao, Zhang, Wang, Li, Dong and Cui

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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Correlation matrix of 15 selected features. Values in this figure indicated the correlation coefficient of two corresponding variables. Color indicated strength of correlation, in which dark blue indicated strong positive, and dark red indicated strong negative relationships. Diagnosis: year when patients were diagnosed. Diam: diameter of tumor. Lymex: number of excised lymph nodes. Lympo: number of positive lymph nodes. Lymph: positive lymph nodes or not. Spread: extension of tumor. Surg: surgery or not. Surgery: surgery type.