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Maternal serum Down syndrome screening: Free β-protein is a more effective marker than human chorionic gonadotropin

Down SyndromeFertilityHuman Chorionic GonadotropinReproductive HealthFree β-ProteinGynecologyMaternal HealthPrenatal DiagnosisMaternal-fetal MedicinePublic HealthEndocrinologyMedicinePrenatal TestingHigh-risk PregnancyDown Syndrome ScreeningReproductive Endocrinology