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Screening at 11-13+6 weeks' gestation.
Sonek JD, Nicolaides KH, Janku P.
Ceska Gynekol 2012;77:92-104. -
Tricuspid regurgitation in screening for trisomies 21, 18 and 13 and Turner syndrome at 11 + 0 to 13 + 6 weeks of gestation.
Kagan KO, Valencia C, Livanos P, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2009;33:18-22.