8[2]Witter FR.ProstaglandinE2 preparation for prei-nduction cervical ripening clinical.Obstet Gynecol,2000,43:469-474.
9乐杰.妇产科学[M].北京:人民卫生出版社,2003.360.
10Atad J, Hallak M, Auslender R, et al. A randomized com- parison of prostaglandin E2, oxytocin, and the double-bal- loon device in inducing labor[J]. Obstet Gynecol, 1996,87 (2): 223 227.