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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. -
Placental volume in twin and triplet pregnancies measured by three-dimensional ultrasound at 11 + 0 to 13 + 6 weeks of gestation.
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Ultrasound Obstet Gynecol 2006;27:647-51.