3[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.
4[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.
5[3]Polzin WJ ,Brady K. The etiology of premature rupture of the membranes. Clin Obstet Gynecol 1998,41:810~816.
6[4]Kubota T. Relationship between matenal group B streptococcal conlonization and pregnancy outcome. Obstet Gynecol, 1998,92:926 ~930.