[Investigation on improving the diagnostic accuracy of gallstones by ultrasonography].
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002769:Cholelithiasis / Q000175:diagnosis*; D003549:Cystic Duct; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography