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. 2019 Nov 28;9:1330. doi: 10.3389/fonc.2019.01330

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Copyright © 2019 Zhang, Feng, Cai, You, Fan, Lv, Min and Wang.

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 heatmaps of the features before (A) and after (B) correlation filtering. Before correlation filtering, a mass of redundant features with high correlation coefficients existed.