| Role of prenatal ultrasonography in women with positive screen for Downsyndrome on the basis of maternal serum markers |
Nyberg, D.A.;Luthy, D.A.;Cheng, E.Y.;Sheley, R.C.;Resta, R.G.;Williams, M.A.; |
American Journal of Obstetrics and Gynecology |
1995-10-01 |
查看 |
