No abstract available
MeSH terms
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Abortion, Spontaneous / epidemiology*
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Amniocentesis / methods
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Amniocentesis / standards*
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Chorionic Villi Sampling / methods
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Chorionic Villi Sampling / standards*
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Female
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Humans
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Meta-Analysis as Topic
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Observational Studies as Topic
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Pregnancy
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Randomized Controlled Trials as Topic
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Risk Assessment
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Social Class