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. 2022 Apr 19;12:6448. doi: 10.1038/s41598-022-10396-5

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Forest plot comparing (a) PaO₂/FiO₂ ratio and (b) PaCO₂ level between HFNO and control groups. HFNO, high-flow nasal oxygenation; IV, inverse variance; CI, confidence interval.