Normal preoperative levels of gamma-glutamyltransferase predict the absence of common bile duct stones in patients scheduled for laparoscopic cholecystectomy: a retrospective cohort study

术前γ-谷氨酰转移酶水平正常可预测拟行腹腔镜胆囊切除术患者无胆总管结石：一项回顾性队列研究