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Kaplan-Meier estimates of idiopathic pulmonary fibrosis (IPF)-related mortality according to proton pump inhibitor (PPI) use. Green continuous line represents patients with PPI use over the cut-off value. Blue dotted line represents patients with PPI use for less than the cut-off value. (A) The cut-off value was 2 months, (B) 3 months, and (C) 4 months.
