title: Inorganic pyrophosphate concentration in the urine of rheumatoid arthritic patients.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000652:urine*; D011756:Diphosphates / Q000652:urine*; D005260:Female; D006801:Humans; D008875:Middle Aged
chemical_list: D011756:Diphosphates