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. 2018 Jun 15;23(6):1460. doi: 10.3390/molecules23061460

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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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Graphical description of $P M D_{p c}$ . Matrix $X$ is decomposed into two base matrices, namely, U, V, and a diagonal matrix $Δ$ .