A 14-year old girl presents with mild epigastric pain. Laboratory studies include an AST 125 IU/L, ALT 180 IU/L, total bilirubin 1.8 mg/dL, direct bilirubin 1.2 mg/dL, amylase of 400 u/L, lipase of 500 u/L. Right upper quadrant ultrasound shows small stones in the gallbladder with a 7-mm...