7Heron M,Sutton PD,Xu J,et al.Annual summary of vital statistics:2007.Pediatrics,2010,125:4-15.
8Lumbiganon P,Laopaiboon M,Gülmezoglu AM,et al.Method of delivery and pregnancy outcomes in Asia:the WHO global survey on maternal and perinatal health 2007.Lancet,2010,375:490-499.
9Villar J,Valladares E,Wojdyla D,et al.Caesarean delivery rates and pregnancy outcomes:the 2005 WHO global survey on maternal and perinatal health in Latin America.Lancet,2006,367:1819-1829.
10Hansen AK,Wisborg K,Uldbjerg N,et al.Elective caesarean section and respiratory morbidity in the term and nearterm neonate.Acta Obstet Gynecol Scand,2007,86:389-394.
