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Cohort Selection. Symptomatic cholelithiasis defined by 1) Primary diagnosis of ICD-9-CM code 574 of 575 or 2) Primary diagnosis of acute pancreatitis (577.0) and a secondary diagnosis of 574 or 575. Only patients ≥66 who underwent CT and/or US in the month before or after diagnosis were included. Patients who underwent cholecystectomy at initial presentation were excluded. CT=computed tomography, US=ultrasound.
