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Serum (A) and tear (B) LTF concentrations in control subjects and KC patients. Statistical differences with regard to controls: *** p < 0.0001. Sample size: (A) controls = 20 eyes, KC = 40 eyes; (B) controls = 40 eyes, KC = 50 eyes. Abbreviations: KC, keratoconus; LTF, lactoferrin.
