海量图书期刊资源，随时随地畅享阅读乐趣
Second-trimester maternal serum alpha-fetoprotein screening of pregnancies characterized by first-trimester isolated prominent fetal nuchal translucencies and normal karyotypeLee P. Shulman; Owen P. Phillips; Susan J. Gross; Teresa A. Cervetti; Chris Grevengood; Sherman Elias · 1995