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(A) ROC curve analysis showing the diagnostic sensitivity and specificity of serum SP‐D and Ang‐2 levels in patients with COVID‐19. (B) ROC curve analysis showing the diagnostic sensitivity and specificity of serum SP‐D and Ang‐2 levels for endothelial dysfunction. Ang‐2, angiopoetin‐2; ROC, receiver‐operating characteristic curve; SP‐D, surfactant protein D
