LEP and idiopathic pulmonary fibrosis: By comparing the areas under ROC curves, we found plasma leptin (0.761, p = 0.000; 0.729, p = 0.003) was a better biomarker of IPF acute exacerbation and survival than CRP (0.734, p = 0.002; 0.690, p = 0.010) (Supplementary Figures 1(A) and 1(B) in Supplementary Material available online at http://dx.doi.org/10.1155/2016/6940480).