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. 2017 Mar 9;13(5):52. doi: 10.1007/s11306-017-1194-y

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Fig. 3 — Multivariate modelling resulting from the analysis of urine ¹H-NMR spectra before variable selection (823 variables). a OPLS-DA score plot for the comparison between PCa patients (red circle) vs. individuals diagnosed with BPH (blue circle); b internal validation of the corresponding OPLS-DA model by permutation analysis (n = 100), R² (green diamond), Q² (blue square)