9Ananth CV,Savitz DA,Bowes WA Jr,et al.Influence of hypertensive disorders and cigarette smoking on placental abruption and uterine bleeding during pregnancy.Br J Obstet Gynecol,1997,104:572-578.
10Misra DP,Ananth CV.Risk factor profiles of placental abruption in first and second pregnancies:heterogeneous etiologies.J Clin Epidemiol,1999,52:453-461.