title: [Proceedings: Chemical composition of biliary calculi producing no shadow in the x-ray picture].
mesh_terms: D001654:Bile Pigments / Q000032:analysis; D001663:Bilirubin / Q000032:analysis; D002119:Calcium Carbonate / Q000032:analysis; D002769:Cholelithiasis / Q000000981:diagnostic imaging* / Q000378:metabolism; D002784:Cholesterol / Q000032:analysis; D006801:Humans; D011188:Potassium / Q000032:analysis; D011859:Radiography
chemical_list: D001654:Bile Pigments; D002784:Cholesterol; D002119:Calcium Carbonate; D001663:Bilirubin; D011188:Potassium
vernacular_title: Die chemische Zusammensetzung röntgenologisch nict schattengebender Gallensteine