3AYOUBI J M, FANCHIN R. Ultrasonographic observation of uterine contractility. New perspectives[J]. J Reprod Med, 2002, 47(3):204-210.
4BULLETTI C, DE Z D, SETTI P L,et al. The patterns of uterine contractility in normal menstruating women: from physiology to pathology[J]. Annals of the New York Academy of Sciences, 2004, 1034:64-83.
5BULLETTI C, DE Z D, POLLI V, et al. Uterine contractility during the menstrual cycle [J]. Human reproduction, 2000, 15 (sup 1) :81-89.
6SAAV I, ARONSSON A, MARIONS L, et al. Cervical priming with sublingual misoprostol prior to insertion of an intrauterine device in nulliparous women: A randomized controlled trial[J]. Human Reproduction, 2007,22 (10) : 2647- 2649.
