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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. -
Chorionic villus sampling at 11 to 13 weeks of gestation and hypertensive disorders in pregnancy.
Khalil A, Akolekar R, Pandya P, Syngelaki A, Nicolaides K.
Obstet Gynecol 2010;116:374-80.