title: Nongaussian distribution of second-trimester results for serum free estriol.
authors.forename: S
authors.initials: S
authors.lastname: Holding
mesh_terms: D004314:Down Syndrome / Q000097:blood; D004964:Estriol / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012016:Reference Values
chemical_list: D004964:Estriol