2Grobman WA, Gersnoviez R, Landon MB, et al. Pregnancy outcomes for women with placenta previa in relation to the number of prior cesarean deliveries [J]. Obstet Gynecol, 2007, 114(6) : 1249-1255.
4MacDorman MF, Menacker F, Declercq E. Cesarean birth in the United States: Epidemiology, trends and outcomes[ J ]. Clin Per- inato1,2008 ,35 :293-307.
5Betram AP, Merialdi M, Laner JA, et al. Rates of caesarean section: Analysis of global, regional and national estimates [ J 1. Paediat & Perinat Epidemiol, 2007,21,98-113.
6Lumbiganon P, Laopaiboon M, Giilmezoglu AM, et al. Method of delivery and pregnancy outcomes in Asia: the WHO global sur- vey on maternal and perinatal health 2007-08 [ J]. Lancet,2010,375 (9713 ) :490-499.
7Deneux-Tharaux C,Carmona E, Bouvier-Colle MH, et al. Post-partum mortality and cesarean delivery [ J ]. Obstet Gynecol, 2006,108 ( 3 ) :541-548.
9Martel MJ,MacKinnon CJ. Cuidelines for vaginal birth after previous Caesarean birth[J].Journal of Obstetrics and Gynaecology(Canada),2005,(02):164-188.
10Emmanuel B. Evaluating professional scoiety guidelines on vaginal birth after cesaresn[J].Seminars in Perinatology,2010,(05):314-317.