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2. Sequential screening for trisomy 21 by nuchal translucency measurement in the first trimester and maternal serum biochemistry in the second trimester in a low-risk population. Schuchter K, Hafner E, Stangl G, Ogris E, Philipp K. Ultrasound Obstet Gynecol; 2001 Jul; 18(1):23-5. PubMed ID: 11489220 [Abstract] [Full Text] [Related]
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