Serum alanine aminotransferase (ALT), aspartate aminotransferase, alkaline phosphatase (ALP), gamma-glutamyl transpeptidase (GGT), total protein, albumin, globulin, total bilirubin and conjugated bilirubin levels were measured to evaluate liver function. In order to obtain data with good sensitivity and validity, serum samples were analyzed blindly and in triplicate