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2 × 2 table of LC–MS/MS vs ELISA immunoassay results from banked negative urine samples and participants in PUMA study. 115 banked negative samples + 102 urine samples from patients taking TDF/FTC in PUMA study; LC–MS/MS gold standard. TP = True positive; FP = false positive; FN = false negative; TN = true negative.
