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(A) Number of endothelial progenitor cells (EPCs) in all study subjects, and number of EPCs stratified by (B) diabetic retinopathy severity, (C) sex, (D) smoking status, (E) diabetic duration ≤ 15 years versus > 15 years, and (F) hemoglobin A1C level ≤ 8% versus 8%. Asterisks and circles in the plot represent the extreme outlier values and outlier values, as defined by the box blot, respectively.
