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5. Screening for trisomy 21 by fetal tricuspid regurgitation, nuchal translucency and maternal serum free beta-hCG and PAPP-A at 11 + 0 to 13 + 6 weeks. Falcon O, Auer M, Gerovassili A, Spencer K, Nicolaides KH. Ultrasound Obstet Gynecol; 2006 Feb; 27(2):151-5. PubMed ID: 16388509 [Abstract] [Full Text] [Related]
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