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Metaregression of potential factors influencing heterogeneity of reported prevalence of interstitial lung disease (ILD) within each connective tissue disease. a) Rheumatoid arthritis (RA), b–d) systemic sclerosis (SSc), e–f) idiopathic inflammatory myositis (IIM). There were insufficient data to support meta-regression for primary Sjögren's syndrome, systemic lupus erythematosus, mixed connective tissue disease and undifferentiated connective tissue disease.
