4Hensen JH, Van Breda, Vriesnan AC, et al. Abdominal wall endometriosis:clinical presentation and imaging features with em- phasis on sonography [ J ]. Am J Roentgenol, 2006, 186 (3) : 616-620.
5Renz PH, David MR, Buist AS,et al. Caesarean section delivery and the risk of allergic disorders in childhood [ J]. Clin Exp Allergy ,2005,35 ( 11 ) : 1466-1472.
6Bahl R,Patel RR, Swingler R, et al. Neurodevelopmental outcome at 5 years after operative delivery in the second stage o f labor:a cohort study [ J ]. Am J Obstet Gynecol, 2007, 197 : 147. e1- 6.
7World Health Organization. Appropriate technology for birth [ J ]. Lancet, 1985,2:436-437.
8Brennan DJ,Robson MS,Murphy M, et al. Comparative analysis of intemational cesarean delivery rates using 10-group classification identifies significant variation in spontaneous labor[ J ]. Am J Obstet Gynecol,2009,201:308. e1-8.
9Lumbiganon P, Laopaiboon M, Gulmezoglu AM, et al. Method of delivery, and pregnancy outcomes in Asia: the WHO global survey on maternal and perinatal health 2007-08[J]. Lancet,2010,375 (9713) :490-499.
10Klemetti R, Che X, Gao Y, et al. Cesarean section delivery among primiparous women in rural China: an emerging epidemic [J]. Am J Obstet Gynecol,2010,202( 1 ) :65. e1-6.
