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Bland–Altman plots for intraobserver variability of 2 exemplary retinal traits in PREMATCH children: central retinal arteriolar equivalent (a, c) and curvature tortuosity (b, d). Plots include 10 cases (closed symbols) and 10 controls (open symbols), each read twice by observer 1 (Q.-F.H.) and observer 2 (Z.-Y.Z.).
