title: Gall stone disease in southern Iran: lucent versus opaque stones.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002118:Calcium / Q000032:analysis; D002769:Cholelithiasis / Q000000981:diagnostic imaging* / Q000378:metabolism; D002784:Cholesterol / Q000032:analysis; D005260:Female; D006801:Humans; D007492:Iran; D008297:Male; D008875:Middle Aged; D010860:Pigments, Biological / Q000032:analysis; D011859:Radiography; D012737:Sex Factors
chemical_list: D010860:Pigments, Biological; D002784:Cholesterol; D002118:Calcium