4American College of Obstetricians and Gynecologists.ACOG Com-mittee Opinion No.394,December 2007.Cesarean delivery onmaternal request[J].Obstet Gynecol,2007,110(6):1501.
5LUMBIGANON P,LAOPAIBOON M,GüLMEZOGLU A M,etal.Method of delivery and pregnancy outcomes in Asia:the WHOglobal survey on maternal and perinatal health 2007-08[J].Lan-cet,2010,375(9713):490-499.
6DALTVEIT A K,TOLLANES M C,PIHLSTROM H,et al.Ce-sarean delivery and subsequent pregnancies[J].Obstet Gynecol,2008,111(6):1327-1334.
7[No authors listed].ACOG Practice Bulletin#54:vaginal birth afterprevious cesarean[J].Obstet Gynecol,2004,104(1):203-212.