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Deming regression of ETKAC measured in erythrocyte hemolysates collected in either ETDA or lithium heparin (LH) blood tubes from 15 adults. Open circles, observed data points; solid line, regression line; dashed line, line of equality. Slope (95% CI) = 0.88 (0.37–1.39); intercept (95% CI) = 0.26 (−0.44 to 0.68).
