5Mitchell SC,Korones SB,Berendes HW.Congenital heart disease in 56109 births:incidence and natural history.Circulation,1971,43:323-332.
6Bahado RO,Wapner R,Thom E,et al.Elevated first-trimester nu-chal translucency increases the risk of congenital heart de-fects.Amer J of Obstetrics and Gynecology,2005,192:1357-1361.
7Maiz N,Plasencia W,Dagklis T,et al.Ductus venosus Doppler in fetuses with cardiac defects and increased nuchal translucency thickness.Ultrasound Obstet Gynecol,2008,31:256-260.
8McAuliffe FM,Lisa MD,Hornberger K,et al.Fetal cardiac defects and increased nuchal translucency thickness:A prospective stud-y.American J of Obstetrics and Gynecology,2004,191:1486-1490.
9Clur SA,Mathijssen IB,Pajkrt E,et al.Structural heart defects associated with an increased nuchal translucency,9 years experi-ence in a referral centre.Prenat Diagn,2008,28:347-354.
10Pajkrt KL,Bilardo CM,van Lith JMM,et al.Nuchal translucency measurement in normal fetuses.Obstet Gynecol,1995,86:994-997.