Letter: Screening for neural-tube defects.
D000757:Anencephaly / Q000175:diagnosis*; D005069:Evaluation Studies as Topic; D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D016135:Spinal Dysraphism / Q000175:diagnosis*; D000509:alpha-Fetoproteins / Q000032:analysis*
D005326:Fetal Proteins; D000509:alpha-Fetoproteins