Cholangiopancreatography, Endoscopic Retrograde medicine.medical_specialty Endoscopic retrograde cholangiopancreatography medicine.diagnostic_test business.industry Duodenum General Engineering 030230 surgery Surgery Duodenal ulcer 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Peptic Ulcer Perforation Intestinal Perforation Duodenal Ulcer medicine Humans business Duodenal Perforation