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. 2021 Mar 4;11:5218. doi: 10.1038/s41598-021-84878-3

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© The Author(s) 2021, corrected publication 2021

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Screenshot of the respiratory monitoring function (home-made software). The orange line shows the live respiratory movement. When an apnea is performed, the curve stabilizes and a reference level can be defined (blue line). A gating threshold is also displayed as a green tube to help verifying apnea or breath-hold repeatability.