No abstract available
MeSH terms
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Austria
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Cell-Free System*
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Chromosome Aberrations*
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DNA / genetics*
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Down Syndrome / diagnosis*
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Down Syndrome / genetics*
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Female
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Germany
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Humans
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Infant, Newborn
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Maternal Serum Screening Tests / methods*
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Practice Guidelines as Topic
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Pregnancy
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Prenatal Diagnosis / methods*
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Switzerland
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Ultrasonography, Prenatal