Department of General Surgery,Tan Tock Seng Hospital,Singapore 308433,Singapore;
MOH Holdings,Singapore 099253,Singapore;
Yong Loo Lin School of Medicine,National University of Singapore,Singapore 117597,Singapore;
Cholangitis; Choledocholithiasis; Cholelithiasis; Aged 80 and over; Geriatrics; Cholangiopancreatography; Endoscopic retrograde;