2Porreco R P,Thorp JA.The cesarean birth epidemic:Trends,Causes and Solutions[J].Am J Obstet Gynecol,1996,179:657 ～ 664.
3Lu GC,Rouse DJ,DuBard M,et al.The effect of the increasing prevalence of maternal morbidity[J].Am J Obstet Gynecol,2001,185:845-849.
4Lage M,Ricardo V,Maria A,et al.Serumleptin levels in women throughout pregnancand the postpartum period and in women suffering from spontaneous abortion[J].Clin Endcrinol,1999,50(2):211.
5Kaiser PS,Kirby RS.Obesity as risk factor for cesarean in a low risk population[J].Obstet Gynecol,2001,97:39-43.
