title: First- and Second-trimester Down Syndrome Screening: Current Strategies and Clinical Guidelines.
authors.forename: Horng-Jyh
authors.initials: HJ
authors.lastname: Tsai
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis