5Nicolaidcs KH, Azar G, Byme D, et ak Fectal nuchal translu- cency: ultrasound screening for chromosomal defects in the first tri- mester of pregnancy. BMJ, 1992, 304= 867 - 869.
6Souka P, Krampl E, Bakalis S, et al. Outcome of pregnancy in ehromosomally normal fetuses with increased nuehal translu- cency in the first trimester. Ultrasound Obstet Gyneeol, 2001. 18, 9-17.
7Adekunle O, Gopee A, E1 Sayed M, et ak Increased first trimes- ter nuchal translucency: Prewaancy and infant outcomes after rou- tine screening for l)own's syndrome in an unseleced antenatal popu- latiorL Br J Radiol, 1999, 72:457 - 460.
8Van Vugt JM, Tinnei'nans BW, Van Zalen- Sprcck RM, et ak Outcome and early childhood follow--up of chromosomally normal fetuses with increased nuchal translucency at 10- 14 weeks' gesta- tion. Ultrasound Obstet Gyneeol, 1998, 11: 407-409.
9陆国辉.产前遗传病诊断.广州:广东科技出版社,2001:87.
10Caughey A, Kuppernann M, Norton M, et al. Nuchal translu- cency and first trimester biochemical markerts for Down syndryme screeniDg: A Cost--effectivenses analysisis Am J Obstet Gynecol, 2002, 187: 1239-1245.