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Comparison of serum TGF-β1 and Smad2 expression levels before and after treatment. A: Comparison of serum TGF-β1 expression level before and after treatment; B: Comparison of serum Smad2 expression level before and after treatment. Compared with that of the same group before treatment, ***P<0.001; compared with that of the control group after treatment, ##P<0.01.
