No abstract available
MeSH terms
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Abortion, Spontaneous / epidemiology
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Amniocentesis / standards*
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Amniocentesis / trends
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Chorionic Villi Sampling / standards*
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Chorionic Villi Sampling / trends
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Clinical Competence*
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DNA / blood
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Female
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Humans
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Obstetrics / education*
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Obstetrics / standards
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Pregnancy
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Prenatal Diagnosis / standards*
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Prenatal Diagnosis / trends
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Trisomy / diagnosis*