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. 2016 Aug 3;6:30540. doi: 10.1038/srep30540

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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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The horizontal error bars represent variability of CCO and the vertical error bars represent variability of HbO or Hb. The correlation coefficient of the fitted line is r = 0.92 with a p value of 0.001.