No abstract available
MeSH terms
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Abortion, Spontaneous / blood*
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Abortion, Spontaneous / diagnostic imaging*
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Algorithms
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Chorionic Gonadotropin / blood
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Decision Trees
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Female
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Humans
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Pregnancy
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Pregnancy Trimester, First
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Prenatal Diagnosis / methods*
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Progesterone / blood
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Sensitivity and Specificity
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Ultrasonography
Substances
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Chorionic Gonadotropin
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Progesterone