Difficult duodenum during endoscopic retrograde cholangiopancreatography.
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D014670:Ampulla of Vater; D002760:Cholangiopancreatography, Endoscopic Retrograde / Q000295:instrumentation*; D004378:Duodenal Diseases / Q000150:complications* / Q000175:diagnosis; D020698:Duodenoscopes; D004867:Equipment Design; D006801:Humans