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Comparison of serum carbohydrate antigen 199 (CA199) levels among three age subgroups in males and females. aP<0.05, bP<0.01 versus the non-metformin group; cP<0.05, dP<0.01 versus the short-term metformin group; eP<0.05, fP<0.01 versus males of the non-metformin group; gP<0.05 versus males of the total group.
