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Screening at 11-13+6 weeks' gestation.
Sonek JD, Nicolaides KH, Janku P.
Ceska Gynekol 2012;77:92-104. -
Nasal bone assessment in fetuses with trisomy 21 at 16-24 weeks of gestation by three-dimensional ultrasound.
Persico N, Molina F, Azumendi G, Fedele L, Nicolaides KH.
Prenat Diagn 2012;32:240-4.