title: Some chemical and bacterial contributions to analytical variation in urinary oestrogen quantitations during pregnancy.
mesh_terms: D001419:Bacteria / Q000302:isolation & purification; D004964:Estriol / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011309:Preservation, Biological / Q000379:methods; D013696:Temperature; D013849:Thimerosal / Q000494:pharmacology; D013997:Time Factors
chemical_list: D013849:Thimerosal; D004964:Estriol