3Harris BA.Peripheral placental separation:A possible relationship to premature labor.Obstet Gynecol,1985,66:774
4Ananth CV.Incidence of placenta abruptio in cigarette smoking and hypertensive disorders during pregnancy:metaanalysis of obstrvatimal studies.Obstet Gynecol,1999,93 (4):622
5Hurdww.Mlodorrik cs,hertzberg V et al.Selective management of abruptio placentae:a prospective study.Obstet Gynecol,1983,61 (3):467
