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. 2021 May 31;50(5):700–705. doi: 10.1016/j.hrtlng.2021.05.003

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Fig 2 — Correlation between P_aO2/F_IO2 ratios and lung ultrasound score during follow up in 33 COVID-19 patients. r: Pearson's correlation coefficient; LUS: lung ultrasound score.