title: Down syndrome and open neural tube defect screen-positive pregnancies: premature delivery and premature placental karyotyping.
authors.forename: P A
authors.initials: PA
authors.lastname: Benn
mesh_terms: D002885:Chromosomes, Human, Pair 16; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D015994:Incidence; D007621:Karyotyping; D009436:Neural Tube Defects / Q000453:epidemiology*; D007752:Obstetric Labor, Premature / Q000453:epidemiology*; D010920:Placenta / Q000473:pathology; D011247:Pregnancy; D011256:Pregnancy Outcome; D011296:Prenatal Diagnosis; D012307:Risk Factors; D014314:Trisomy / Q000175:diagnosis* / Q000235:genetics