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Flow chart of patient enrollment. CT, computed tomography; COVID‐19, coronavirus disease; GGOs, ground‐glass opacities; ILD, interstitial lung diseases; KL‐6, Krebs von den Lungen 6; NAAT, nucleic acid amplification test; SARS‐COV‐2, severe acute respiratory syndrome coronavirus 2; SP‐D, surfactant protein D
