For this study , 50 patients were randomly assigned to undergo either HPLC ( n = 25 ) or LPLC ( n = 25 ) Liver function tests including total bilirubin , gamma-glutamyltransferase ( GGT ) , alkaline phosphatase ( ALP ) , aspartate aminotransferase ( AST ) , and alanine aminotransferase ( ALT ) were obtained preoperatively , then 24 and 48 h postoperatively .
