4Razial A,Golan A,Ariely S,et al. Repeated ultrasonography and intramuscular methofrexate in the conservation management of residual adherrent plsceta[J]. Clin Ultrasound, 1992,20:288.
5Bakri Y N, Rifai A,Legasth J.Placents previs-percreta:Magnefic resonance imsging findings and methotrexate therapy after hysterectomy[J]. Am J Obstet Gynecol,1993, 169-213.
6Tabsh KMA, Brinkrnan CR, King W. Ultrasound diagnosis of placenta increta[J]. Chn Ultrasound ,1982,10: 288.