cholangiography
cholangiopancreatography, endoscopic retrograde
cholangiopancreatography, magnetic resonance
cholecystography
colonography, computed tomographic
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cholangiopancreatography, endoscopic retrograde
endoscopy, gastrointestinal
colonoscopy
sigmoidoscopy
duodenoscopy
gastroscopy
proctoscopy
esophagoscopy
esophageal ph monitoring
gastric acidity determination
gastrointestinal transit
lactose tolerance test
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pancreatic function tests
portography
sialography