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A model for a new pyramid of prenatal care based on the 11 to 13 weeks' assessment.
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Prenat Diagn 2011;31:3-6. -
Likelihood ratio for trisomy 21 in fetuses with tricuspid regurgitation at the 11 to 13 + 6-week scan.
Faiola S, Tsoi E, Huggon IC, Allan LD, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;26:22-7.