A 13-year old girl presents with mild epigastric pain. Laboratory studies include an AST 135 IU/L, ALT 173 IU/L, total bilirubin 1.9 mg/dL, direct bilirubin 1.4 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...