5Dare FO,Oboro VO.Risk factors of placenta increta in lle,nigeria.Niger Postgrad Med J,2003,10:42-45.
6Guy GP,Peisner DB,Timor-Tritsch IE.Ultrasonographic evaluation of uteroplacental blood flow patterns of abnormally located and adherent placentas.Am J Obstet Gynecol,1990,163:723-727.
7Lerner JP,Deane S,Timor-Tritsch IE.Characterization of placenta accreta using transvaginal sonography and color Doppler imaging.Ultrasound Obstet Gynecol,1995,5:198-201.
8Chou MM,Ho ES,Lee YH.Prenatal diagnosis of placenta previa accreta by transabdominal color Doppler ultrasound.Ultrasound Obstet Gynecol,2000,15:28-35.
9Taipale P,Orden MR,Berg M,et al.Prenatal diagnosis of placenta accreta and percreta with ultrasonography,color Doppler,and magnetic resonance imaging.Obstet Gynecol,2004,104:537-540.
10Levine D,Hulka CA,Ludmir J,et al.Placenta accreta:evaluation with color Doppler US,power Doppler US,and MR imaging.Radiology,1997,205:773-776.
