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Flow chart of the study selection process. The literature search identified a total of 2,559 citations. After contacting experts in the field, three additional abstracts were added. Twenty-six studies fulfilled our inclusion criteria. Quantitative results for individual test results were available from authors for 19 of 26 studies that evaluated QuantiFERON and were partially available from 1 study. IGRA = IFN-γ release assay; TB = tuberculosis.
