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ROC curves of single and double FIT sampling strategies for the detection of screen relevant neoplasia. FIT = faecal immunochemical test, "one of two FITs+" = at least one of both FITs above the cut-off value, "two of two FITs+" = both FITs above the cut-off value, "mean of two FITs+" = geometric mean of both FITs above the cut-off value, AUC = area under the curve, CI = confidence interval.
