2Jeffrey MB, Frank HB, Allen PK, et al. Induced abortion: a risk factor placenta previa [J]. Am J Obstet Gynecol, 1981,141(2)∶769.
3Gonsoulin W, Kennedy RT, Guidry KH. Electiv versus emergency cesarean hysterectomy Cases in a residency program setting: a review of 129 cases from 1984 to 1988.[J]. Am Jobstet Gynecol, 1991, 165(1):91.
4Radeka G,Milasinovic L, Vejnovic T, et al. Cesarean hysterectomy in modem obstetrical practice from 1968 to 1993[J]. Med Pregl, 1997,50(9-10)∶375.