CHD4 and idiopathic pulmonary fibrosis: A sub analysis of CTD-ILD compared to IPF showed strong associations of antibodies Mi-2β (OR 0.2; 1/OR 5.3; p = 0.001), Ku (OR 0.1; 1/OR 10; p = 0.034) and SRP (OR 0.1; 1/OR 7.7; p = 0.013; S5 Table in S1 File) with IPF.