title: Letter: Effect of sapirin on oestriol excretion in pregnancy.
mesh_terms: D000328:Adult; D001241:Aspirin / Q000008:administration & dosage / Q000494:pharmacology*; D002940:Circadian Rhythm; D004964:Estriol / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy
chemical_list: D004964:Estriol; D001241:Aspirin