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Effects of OA on the scar elevation index (SEI). The degree of scar hypertrophy can be reflected by SEI, which represents the ratio of total scar connective tissue area to the area of underlying dermis. After treatment with OA for 28 days, the formed hypertrophic scars decreased in a dose-dependent manner. **P < 0.01 versus the control group. Data are expressed as the mean ± SD. n = 16.
