title: Studies on the composition of gallstones in the Sudan.
mesh_terms: D001646:Bile / Q000032:analysis; D002118:Calcium / Q000032:analysis; D002769:Cholelithiasis / Q000378:metabolism*; D002784:Cholesterol / Q000032:analysis; D006801:Humans; D010758:Phosphorus / Q000032:analysis; D013397:Sudan
chemical_list: D010758:Phosphorus; D002784:Cholesterol; D002118:Calcium