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Pregnancy
Gestational Age
Prenatal Diagnosis
Polymerase Chain Reaction
Ultrasonography, Prenatal
Fetuses
Placenta
Fetal Blood
Hong Kong
DNA
Pregnancy-Associated Plasma Protein-A
Prospective Studies
First Pregnancy Trimester
Pregnancy Outcomes
Biological Markers
Retrospective Studies
Second Pregnancy Trimester
Reference Values
Newborn Infant
Premature Obstetric Labor
Co-Publications
85
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28
19
15
11
9
8
7
6
5
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