ABCA3 and rheumatoid arthritis: Of the twenty-four patients, nine (37.5%) had idiopathic pulmonary fibrosis (IPF), five (21%) had connective tissue disease-related ILD (two cases of rheumatoid arthritis and three cases of myositis), four (17%) had idiopathic non-specific interstitial pneumonia (NSIP), three (12.5%) had hypersensitivity pneumonia, one had desquamative interstitial pneumonia, one had post-acute respiratory distress syndrome (ARDS) fibrosis and one patient had ILD with a mutation of the ABCA3 gene.