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. 2016 Dec 7;6:38733. doi: 10.1038/srep38733

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Experimental data points were obtained using a commercial device. Dashed lines represent the best-fit curves, as determined by the power equation (see text).

Inline graphic — Experimental data points were obtained using a commercial device. Dashed lines represent the best-fit curves, as determined by the power equation (see text).