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The incidence of anencephaly ranges from 0.1 to 6.7 per 1,000 births. Female fetuses predominated, especially among prematures, with a ratio of between 3 and 7 to 1. The infants are either stillborn or die within a few days of birth. By about 23 days?gestational age the neural tube is complete, except for an opening at each end, the anterior... |
