title: 13C-urea versus 14C-urea breath test--which is the safer?
authors.forename: C
authors.initials: C
authors.lastname: Boivin
mesh_terms: D001944:Breath Tests; D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D006801:Humans; D014508:Urea
chemical_list: D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D014508:Urea