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. 2019 Oct 22;9:122. doi: 10.1186/s13613-019-0597-5

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© The Author(s) 2019

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 — Individual data and mean value of simplified esophageal pressure–time product (sPTP_es) per minute during non-invasive ventilation (NIV) and high-flow nasal cannula (HFNC) at different flow rates. *Indicates p < 0.05 in comparison to HFNC at a flow rate of 10 L/min, **Indicates p < 0.05 in comparison to HFNC at a flow rate of 20 L/min