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This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Changes in serum HCV-RNA levels. Closed circles showed HCV-RNA levels in the retinol group and open circles those in the control group. Data are expressed as the mean ± standard error (SE). **p<0.01; Mann-Whitney U test.