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Pregnancy
Gestational Age
Cervix Uteri
Cervix Mucus
Amnion
Chorion
Extraembryonic Membranes
Relaxin
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
Biological Markers
First Pregnancy Trimester
Risk Factors
Premature Obstetric Labor
Premature Birth
Newborn Infant
Prenatal Diagnosis
Case Control Studies
Ultrasonography, Prenatal
Denmark
Co-Publications
15
8
7
6
5
4
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