TGFB1 and idiopathic pulmonary fibrosis: The downregulation of FENDRR by TGFβ1 was consistently observed in other four normal human fibroblast lines (CCD13‐Lu, CCD19‐Lu, HLF153, and HLF154) and four IPF lung fibroblast lines (LL29, LL97A, IPF12, and IPF14), all cultured in F12K medium.