5Odendaal HJ,Pattinson RC,Bam R,et al.Aggressive or expectant management for patients with severe preeclampsia between 28-32weeks' gestation:a randomized controlled trail[J].Obstet Gynecol,1990,76:1070-1075.
6Vifil-De GP,Montufar-Rueda C,Ruiz J.Expectant management of severe preeclampsia and preeclampsia superimposed of chronic hypertension between 24 and 34weeks'gestation[J].Eur J Obstet Gynecol Reprod Biol,2003,107:24-27.
