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. 2021 Apr 27;59(5):596–601. doi: 10.1016/j.resinv.2021.04.002

Fig. 4.

Fig. 4

Comparison of survival between patients with COVID-19 with KL-6 levels ≥684 U/mL (red line) and those with KL-6 levels < 684 U/mL (black line), using the Kaplan–Meier method. COVID-19, coronavirus disease 2019; KL-6, Krebs von den Lungen-6. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)