Prenatal screening using maternal serum alpha-fetoprotein, human chorionic gonadotropin, and unconjugated estriol: two-year experience in a health maintenance organization.
McDuffie RS, Haverkamp AD, Stark CF, Haverkamp C, Barth CK. Prenatal screening using maternal serum alpha-fetoprotein, human chorionic gonadotropin, and unconjugated estriol: two-year experience in a health maintenance organization. J Matern Fetal Med. 1996 Mar-Apr; 5(2):70-3.