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Survival curves of patients with idiopathic pulmonary fibrosis (IPF) grouped by smoking or BMI: (a) survival curves of patients with IPF nonsmoke (blue line, n = 25) and patients with smoke (green line, n = 12). (b) Survival curves of patients with IPF low BMI (blue line, n = 30) and patients with high BMI (green line, n = 7). Log-rank test was used.
