5Verdin SM, Whitlow B J, Lazanakis M, et al. Ultrasonographic Markers for chromosomal abnormalites in Women with negative nuchal translu- cency and second trimester maternal serum biochemistry [ J ]. Utrasound Obstet Gynecol,2000,16:402 -406.
6Kurjak A, Kos M, Stipoljev F, et al. Ultrasonic markers of fetal chromosomal abnormalities [ J ]. Eur J Obstet Gynecol Reprod B iol, 1999, 85(1) :105 - 108.
7EVERS A C, BROUWERS H A, HUKKELHOVEN C W, et al. Perinatal mortality and severe morbidity in low and high risk term pregnancies in the Netherlands: prospective cohort study [ J ]. BMJ, 2010, 341: c5639.
8BUGENTAL D B, BEAULIEU D A, SILBERT GEIGER A. Increases in parental investment and child health as a result of anearly Intervention [ J ]. J Exp Child Psychol, 2010, 106 ( 1 ) : 30 - 40.
9BURGER S. A cost consequence analysis of outreach strategies for high risk pregnant women [ J ]. J Community Health Nurs, 2010, 27(3) : 137 -145.
10GREEN J M, BASTON H A. Have women become more willing to accept obstetric interventions and does this relate to mode of birth? Data from a prospective study [ J ]. Birth, 2007, 34 (1) : 6 -13.