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. 2018 Aug 20;7(8):223. doi: 10.3390/jcm7080223

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Principal components (PCs) based on the contribution rate using principal component analysis (PCA); (b) The distribution between the first PC and second PC for two groups (normal and pathological).