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Laboratory comparison of patients with common bile duct stones at endoscopic retrograde cholangiography. Laboratory parameters (conjugated bilirubin, total bilirubin, alanine aminotransferase, and gamma-glutamyl transferase) in patients with and without stones. ERCP: Endoscopic retrograde cholangiography; ALT: Alanine aminotransferase; γGT: Gamma-glutamyl transferase.
