No abstract available
MeSH terms
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Abortion, Spontaneous
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Anencephaly / epidemiology*
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Anencephaly / etiology
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Anencephaly / genetics
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Cross-Sectional Studies
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Diseases in Twins
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Europe, Eastern
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Female
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Humans
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Japan
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Male
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Maternal Age
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Parity
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Pedigree
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Pregnancy
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Seasons
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Sex Factors
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Socioeconomic Factors
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Spinal Dysraphism / epidemiology*
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Spinal Dysraphism / etiology
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Spinal Dysraphism / genetics
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Time Factors
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United Kingdom
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United States