6Cunningham FG Gant NF Leveno KL et al.Williams Obstetrics(英文影印版)21st ed[M].北京:科学出版社,2002.699,1461.
7[1]Mclaren J, Taylor DJ,Bell SC. Increased concentration of pro-matrix metalloproteinase 9 in term fetal membranes overlying the cervix before labor. Am J Obstet Gynecol 2000,182: 409～416.
8[2]Riley SC,Leask R,Denisn FC,et al. Secretion of tissue inhibitors of matrix metalloproteinases by human fetal membranes,deciduas and placenta at parturition. J Endocrinol 1999,162: 351～359.
9[3]Polzin WJ ,Brady K. The etiology of premature rupture of the membranes. Clin Obstet Gynecol 1998,41:810～816.
10[4]Kubota T. Relationship between matenal group B streptococcal conlonization and pregnancy outcome. Obstet Gynecol, 1998,92:926 ～930.
