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22. Screening for Down syndrome using first-trimester ultrasound and second-trimester maternal serum markers in a low-risk population: a prospective longitudinal study. Audibert F; Dommergues M; Benattar C; Taieb J; Thalabard JC; Frydman R Ultrasound Obstet Gynecol; 2001 Jul; 18(1):26-31. PubMed ID: 11489221 [TBL] [Abstract][Full Text] [Related]
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