CHI3L1 and idiopathic pulmonary fibrosis: The network included DSP gene, a variant of which are known to confer the risk of developing IPF [42, 43], and 14 biomarkers (CCL18, CD28, CHI3L1, CLU, CXCL13, HSPA4, KRT19, MMP1, MMP7, MUC16, POSTN, SPP1, TNFSF13B, and VCAM1) [2, 44, 45].