1[1]Cande V Ananth,Smulian JC,Vintzileos AM,et al. The association of placenta previa with history of cesarean delivery and abortion: A metaanalysis. Am J Obstet Gynecol,1997,177:1071-1078.
2[2]Dwight J Rouse,Owen J. Prophylactic cesarean delivery for fetal macrosomia diagnosed by means of ultrasonography-A Fustian bargain ? Am J Obestet Gyneco,1999,181:332-338.
3[3]Marie-victoire S, Ancel PY,Bouvier Colle . How dose multiple pregnancy affect maternal mortality and morbidity? Clinical Obstet and Gynecol,1998,41:79-83.
4[4]Combs CA,Laros RK. Prolonged third stage of labor:Morbidity and risk factors. Obstet Gynecol,1991,77:863.
