5Pennell CE, Henderson J J, O'Neill MJ, et al. Induction of labour in nulliparous women with an unfavourable cervix: a randomised controlled trial comparing double and single balloon catheters and PGE2 gel. BJOG, 2009, 116: 1443- 1452.
6Vaknin Z, Kurzweil Y, Sherman D. Foley catheter balloon vs locally applied prostaglandins for cervical ripening and labor induction a systematic review and meta analysis. Am J Obstet Gynecol,2010,203: 418-429.
7GelberS, Sciscione A. Mechanical methods of cervical ripening and labor induction. Clin Obstet Gynecol, 2006, 49: 642-657.
8Levy R, Kanengiser B, Furman B, et al, A randomized trial comparing a 30 ml and an 80 ml Foley catheter balloon forpreinduction cervical ripening. Am J Obstet Gyneco, 2004, 191 : 1632-1636.
9Delaney S, Shaffer BL, Cheng YW, et al. Labor induction with a Foley balloon inflated to 30 ml compared with 60 ml.- a randomized controlled trial. Obstet Gynecol, 2010, 115: 1239-1245.
10Maslovitz S, Lessing JB, Many A. Complications of trans- cervical Foley catheter for labor induction among 1083 women. ArchGynecolObstet, 2010,281:473 477.
