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. 2019 Feb 2;6:4. doi: 10.1186/s40634-019-0175-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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. 1 — Correlation between the age of volunteers and concentrations of PDGF-BB and IGF-1 in PRP samples. PDGF-BB and IGF-1 levels significantly correlated with age (Spearman a: PDGF-BB r=-0.32, p<0.05, b: r=0.39, p<0.05)