[Screening for Down syndrome using first-trimester combined screening followed by second trimester ultrasound examination in an unselected population].
Rozenberg P, Bussières L, Chevret S, Bernard JP, Malagrida L, Cuckle H, Chabry C, Durand-Zaleski I, Bidat L, Lacroix I, et al. Gynecol Obstet Fertil. 2007 Apr; 35(4):303-11. Epub 2007 Mar 9.