title: [Letter: Benzidine demonstration of occult blood in feces].
mesh_terms: D000611:Aminobiphenyl Compounds; D001560:Benzidines; D006801:Humans; D008551:Melena / Q000175:diagnosis; D008722:Methods; D009780:Occult Blood
chemical_list: D000611:Aminobiphenyl Compounds; D001560:Benzidines
vernacular_title: Benzidin-pavisning av okkult blod i faeces