Medicine
Gallstones
Endoscopic retrograde cholangiopancreatography
Acute pancreatitis
Pancreatitis
Prospective cohort study
Abdominal ultrasonography
Common bile duct
Endoscopic ultrasonography
Internal medicine
Gold standard (test)
Biliary disease
Gastroenterology
Radiology
General surgery
Endoscopy
Ultrasonography
