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. 2021 Oct 19;11:769163. doi: 10.3389/fonc.2021.769163

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Copyright © 2021 Xin, Shi, Li, Zuo, Li, Liu, Ma, Du, Xue, Sun and Zhao

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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Principal component analysis (PCA) diagram of serum samples of EOLP group and HC group (A), ROLP group and HC group (D), EOLP group and ROLP group (G) in the negative ion mode, OPLS-DA score diagram (B, E, H) and 200 permutation test (C, F, I) of EOLP group and HC group, ROLP group and HC group, EOLP group and ROLP group in the negative ion mode. E: EOLP; R: ROLP; H: HC.