6[6]Chrysostomou M.Serum antibodies to chlamydia trachomatis in women with ec topic pregnancy,normal pregnancy or salpingitis.Eur J Obstet Gynecol,1992,44:101
7[7]Philips RS.The effect of cigarette smoking,chlamydia tracho-ma tis infection,and vaginal douching on ectopic pregnancy.Obstet Gynecol,1992,79:85
8[8]Michalas S,Minaretzis D.Pelvic surgery,reproductive factors and ri sk of ectopic pregnancy:a case controlled study.Int J Gynecol Obstet,1992,38:101 -105
9[9]Xiong Xu.IUD use and the risk of ectopic pregnancy:a metaan-al ysis of case-control studies.Contraception,1995,52:23-34
10[10]Wollen AL,Flood PR,Sandvei R.Altered ciliary substructure in the endosalpinx in women using an IUCD.Acta Obstet Gynecol Scand,1990,69:307-312
