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. 2017 Mar 28;7:464. doi: 10.1038/s41598-017-00552-7

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© The Author(s) 2017

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Typical PPG waveform. (a) Evolution of the mean pixel value in an arbitrary chosen ROI in the forearm during double venous occlusion. (b) The respective PPG waveform after its normalization to the mean pixel value measured before the first occlusion, deduction of the unity, and inversion.