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Correlation between CFR and MRR in the whole study population. Scatter plot of individual coronary flow reserve (CFR) and microvascular resistance reserve (MRR) values, and the corresponding linear correlation between CFR and MRR (A), as well as the corresponding Bland–Altman plot (B) and a modified Bland–Altman plot with the effect of fractional flow reserve (FFR) on the difference between CFR and MRR (C). Upper limit of agreement (ULA), lower limit of agreement (LLA).
