No abstract available
MeSH terms
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Female
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Gynecology / standards
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Humans
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Inservice Training / standards
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National Health Programs / standards
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Obstetrics / standards
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Poland
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Practice Guidelines as Topic
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Pregnancy
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Pregnancy Complications / prevention & control*
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Prenatal Care / standards*
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Societies, Medical / standards
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Ultrasonography, Prenatal / standards*