<qa>  What is the oxidative stress marker to find possible roles of each BA component in glucose metabolismIn addition, investigator will evaluate the association between each BA species and serum total glucagon like peptide-1 GLP-1 or fibroblast growth factor-19 FGF-19 concentrations to determine if the specific BAs profile is related with total GLP-1 or FGF-19 concentration in serum. Investigatr also evaluates the correlation between each BA species and metabolic profiles and oxidative stress marker to find possible roles of each BA component in glucose metabolism. 