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. 2023 Feb 5;248(4):309–316. doi: 10.1177/15353702221139185

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Figure 1. — Plasma levels of (a) HO-1, (b) HPX, (c) heme, and (d) hemoglobin in patients with COVID-19 and healthy volunteers. Results shown as mean and P values are from Mann–Whitney test or unpaired t-test according to data distribution (n = 28–30 per group).