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Correlations between vitreous and serum 25 (OH) D concentrations. Spearman's correlation tests showed positively significant correlations (A) in PDR group (R = 0.95, P < 0.0001); (B) in NPDR group (R = 0.87, P = 0.0022), and (C) in control group (R = 0.60, P = 0.0026).
