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. 2016 Jul 15;5(1):1079. doi: 10.1186/s40064-016-2787-z

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© The Author(s) 2016

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. 2 — Percentage of signal loss with ECG and PPG, across all the 10-min segments S_i (i = 1,…,6) of H₁ and H₂, represented as boxplots. The horizontal dashed line corresponds to the 15 % signal loss threshold used to exclude segments from analysis of MHR variability indices