2VOLLEBREGT A,VANT HOF DB, EXAHO N. Prepidil- ompmd to propees for cervical ripening [J]. Eur J Obste Gynecol, 2002,104(2): 116.
3MIREZ MM, Labor induction: a review of current methods [J]. Obstet Gynecol Clin North Am,2011,38(2):215-225.
4CALDER AA, EMBREY MP, HILLIER K. Extra-amniot- ic prostaglandin E:for the induction of labour at term[J]. J Obstet Gynecol Er Comnwlth, 1974,81 (1): 39-46.
6THIERY M. Pre-induction cervical ripening [J]. Obstet Gynecol Ann, 1983,12: 103-146.
7COCKS DP. Significance of initial condition of cervix uteri to subsequent course of labour [J]. Br Med J,1955,1 (4909): 327-328.
8CLAMAN P, CARPENTER RJ,REITER A.Uterine rupture with the use of vaginal prostaglandin E:for induction of labor[J]. Am J Obstet Gynecol, 1984,150(7):889-890.
9WITIER FR, ROCCO LE, JOHNSON TRB.A randomized trial of prostaglandin E2 in a controlled-release vaginal pessary for cervical ripening at term [J]. Am J Obstet Gy- neeol, 1992,166(3): 830-834.
10ATAD J,HALLAK M,BEN-DAVID Y,et al. Ripening and dilatation of the unfavourable cervix for induction of labour by a double balloon device:experience with 250 cases[J]. BrJ Obstet Gynaecol, 1997,104(1):29-32.