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Comparisons of patients with diagnoses of diabetes mellitus (DM) plus sickle-cell trait vs. DM without sickle-cell disorders after propensity score matching. Significance is indicated by confidence interval (CI) lines that do not cross risk ratio of 1. DR = diabetic retinopathy; T1DM = type 1 diabetes mellitus; T2DM = type 2 diabetes mellitus.
