No abstract available
MeSH terms
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Cerclage, Cervical
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Cervix Uteri / diagnostic imaging*
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Cervix Uteri / physiology*
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Female
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Fetal Membranes, Premature Rupture / diagnostic imaging
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Humans
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Obstetric Labor, Premature / diagnostic imaging
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Pregnancy
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Pregnancy, Multiple
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Twins
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Ultrasonography, Prenatal*