7Chi I - C, Laufe LE, Gardner SD, et al. An epidemiologic study of risk factors associated with pregnancy following female sterilization. Am J Obstet Gynecol, 1980,36:768 -773.
8Herbert B, Peterson MD, Zhisen Xia, et al. The Risk of Ectopic Pregnancy after Tubal Sterilization. N Engl J Med , 1997,336 ( 11 ) :762 767.
9Peterson HB, Xia Z, Hughes JM, et al. The risk of pregnancy after tubal sterilization: findings from the U. S. Collaborative Review of Sterilization. Am J Obstet Gynecol, 1996,174 : 1161 - 1170.
10Jean Bouyer, Joel Coste, Taraneh Shojaei, et al. Risk Factors for Ectopic Pregnancy: A Comprehensive Analysis Based on a Large Case - Control, Population - based Study in France. Am J Epidemiol,2003, 157:185 - 194.
