Letter: Spontaneous abortion and neural tube defects.
D000022:Abortion, Spontaneous / Q000453:epidemiology; D002490:Central Nervous System / Q000002:abnormalities*; D002869:Chromosome Aberrations / Q000196:embryology / Q000453:epidemiology; D025063:Chromosome Disorders; D005260:Female; D006801:Humans; D011247:Pregnancy