Labor induction in women with an unfavorable Bishop score: randomized controlled trial of intrauterine Foley catheter with concurrent oxytocin infusion versus Foley catheter with extra-amniotic saline infusion with concurrent oxytocin infusion - Guinn,D.A.; Davies,J.K.; Jones,R.O.; Sullivan,L.; Wolf,D. (Am J Obstet Gynecol, 2004)