No abstract available
MeSH terms
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Anencephaly / diagnosis
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Anencephaly / epidemiology*
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Female
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Fetal Diseases / diagnosis
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Fetal Diseases / epidemiology*
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Humans
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Maine / epidemiology
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Pilot Projects
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Pregnancy
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Prenatal Diagnosis*
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Prevalence
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Spina Bifida Cystica / diagnosis
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Spina Bifida Cystica / epidemiology*
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alpha-Fetoproteins / analysis