The Fetal Medicine Foundation

Additional first-trimester ultrasound markers.
Sonek J, Nicolaides K.
Clin Lab Med 2010;30:573-92
The 11-14 week scan.
Nicolaides KH, Heath V, Liao AW.
Baillieres Best Pract Res Clin Obstet Gynaecol 2000;14:581-94

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