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Summary receiver-operating characteristic curves for lung ultrasound for interstitial lung disease diagnosis of systemic sclerosis (a) and rheumatoid arthritis (b). Red dots represent individual articles included in our meta-analysis. SE (AUC), standard error of the area under the curve; Q*, an index defined by the point on the SROC curve where the sensitivity and specificity are equal; SE (Q*), Q* index standard error
