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First-trimester Down syndrome screening: Free β-human chorionic gonadotropin and pregnancy-associated plasma protein A

Down SyndromePregnancy-associated PlasmaFertilityGynecologyMaternal HealthPregnancyPrenatal DiagnosisMaternal-fetal MedicinePublic HealthEndocrinologyMedicinePrenatal TestingHigh-risk PregnancyReproductive Endocrinology