Group I patients (45 cases) underwent a preoperative endoscopic retrograde cholangiopancreatography (ERCP) with endoscopic sphincterotomy (ES) followed by LC in the same hospital admission.

• 组I患者（45例）在同一家医院，在进行LC前行术前内窥镜逆行胰胆管造影术(ERCP)及内窥镜括约肌切开术(ES)。