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. 2019 Feb 28;34(1):60–70. doi: 10.4266/acc.2018.00311

Figure 1.

Figure 1.

Study design and population. In 855 patients who experienced mechanical ventilator use during the analyzed periods, 737 who matched the exclusion criteria and/or who did not have risk factors were excluded. Finally, 118 patients were included and analyzed retrospectively. HFNC: high-flow nasal cannula; LFOS: low-flow oxygen system.