4Johnson LG, Mueller BA, Dalang JR. The relationship or pla- centa previa and history of induced abortion [ J ]. Int J Gynacol Obstet,2003,81 ( 2 ) : 191-198. 被引量：1
5Tuzovic L,Djelmis J,Ilijic M. Obesletric risk factors associat- ed with placenta previa development: case control study [ J ]. Croat Medj ,2003,44 ( 6 ) :728-733. 被引量：1
6Faiz AS, Ananth CV. Etiology and risk factors for placenta previa:an overview and meta-analysis of observational stadies [ J]. J Matem Fetal Neonatal Med .2003.13 ( 3 ) : 175-190. 被引量：1
7Biancani P. Diversity of Ca2 -mobilizing michanisms focus cGMP-mediated Ca2 release form IP3-insenteve Ca2 stores in smooth muscle [ J ]. Am J Phsilo, 1998,274 : c1196. 被引量：1
