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Figure 3 Bland-Altman graphs displaying differences against average values between noninvasive and Gorlin-determined mitral valvular area. The thick line represents mean difference, and the thin lines represent the limits of agreement (all measurements in cm2). PHT = pressure half-time; PISA = proximal isovelocity surface area; RT3D = real-time three-dimensional echocardiography; 2D = two-dimensional echocardiography.
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