内镜下乳头括约肌预切开术在经内镜逆行胰胆管造影胆管插管困难患者中的应用
내경하유두괄약기예절개술재경내경역행이담관조영담관삽관곤난환자중적응용
Application of precutsphincterotomy for endoscopic retrograde cholangiopancreatography with difficult biliary cannu-lation
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