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Inverted Pyramid of Care.
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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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Turning the pyramid of prenatal care.
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Fetal Diagn Ther 2011;29:183-96. -
First trimester urine free beta hCG, beta core, and total oestriol in pregnancies affected by Down's syndrome: implications for first-trimester screening with nuchal translucency and serum free beta hCG.
Spencer K, Noble P, Snijders RJ, Nicolaides KH.
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