No abstract available
MeSH terms
-
Adult
-
Biomarkers / blood
-
China / epidemiology
-
Chorionic Gonadotropin, beta Subunit, Human / blood
-
Down Syndrome / diagnosis*
-
Down Syndrome / epidemiology
-
False Positive Reactions
-
Female
-
Gestational Age
-
Humans
-
Mass Screening
-
Pregnancy / blood*
-
Pregnancy Trimester, Second*
-
Prenatal Diagnosis / methods*
-
alpha-Fetoproteins / analysis
Substances
-
Biomarkers
-
Chorionic Gonadotropin, beta Subunit, Human
-
alpha-Fetoproteins