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Survival according to decline in lung function at 1 year. Kaplan–Meier survival analysis grouped by decline at 1 year in (A) forced vital capacity (FVC) ≥ 5%, (B) FVC ≥ 10%, (C) diffusion capacity of the lung for carbon monoxide (DLCO) ≥ 10% and (D) DLCO ≥ 15%
