[A study on the combined system of stomach and biliary tract mass examination (author's transl)].
D000293:Adolescent; D000328:Adult; D001660:Biliary Tract Diseases / Q000517:prevention & control*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D013272:Stomach Diseases / Q000517:prevention & control*