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In normal condition,intestine mucosa possesses barrier function.When the barrier function of intestine mucosa was damaged,intestinal bacteria,endotoxin,or other substances would enter blood.It is generally accepted that biliary bacteria origins from the intestine either via duodenal papilla or intestinal mucosa.In this study,we aimed to investigate the intestinal permeability changes of cholelithiasis patients to elucidate the possible pathogenesis of cholelithiasis.