all, anatomical, anatomically, anterior, away, back, backs, bile, bladder, bladders, catheter, catheterization, catheters, cavities, cavity, channel, choliangiopancreatography, common, contrast, cut, cut-away, down, duct, ducts, duodenal, duodenoscope, duodenum, dye, endoscope, endoscopic, endoscopy, ercp, esophageal, esophagus, first, front, frontal, galbladder, gall, gall-bladder, gall-bladders, gallbladder, gallbladders, gastric, gi, hepat, injected, inserted, intestinal, intestine, intestines, into, liver, major, material, medical, mouth, oddi, open, opening, oral, oropharynx, pancreas, pancreatic, papilla, passed, performed, plastic, portion, pre-operative, removed, retrograde, small, sphincter, sphincterotomy, stomach, stomachs, taken, throat, tract, vater, ventral, widen, x-rays