6Goldman G. Factors influencing the practice of vaginal birth after cesarean section [J]. Am J Public Health, 1993,83(8) : 1104-1108.
7Rosen M G, Dickinson J C, Westhoff C L. Vaginal after cesarean:a meta-analysis of morbidity and mortality [J ]. Obstet Gynecol, 1991, 77 (3) : 465-470.
8Kaumob A. Vaginal birth after two or more previous cesarean section [J]. Am J Obstet Gyneeol, 1975,216: 156-158.
9Nielsen M D. Rupture and dehiscence of cesarean section scar during pregnancy and delivery [J]. Obstet Gynecol, 1989, 160 (3) :569- 572.