3Al-Zirqi I,Vangen S,Forsen L. Prevalence and risk factors of severe obstetric haemorrhage[J].British Journal of Obstetrics and Gynaecology,2008,(10):1265-1272.doi:10.1111/j.1471-0528.2008.01859.x.
4Hogan MC,Foreman K J,Naghavi M. Matemal mortality for 181 countries,1980-2008:A systematic analysis of progress towards Millennium Development Goal 5[J].The Lancet,2010.1609-1623.
5Bateman BT,Berman MF,Riley LE. The epidemiology of postpartum hemorrhage in a large,nationwide sample of deliveries[J].Anesthesia and Analgesia,2010.1368-1373.
6Rossi AC,Lee RH,Chmait RH. Emergency postpartum hysterectomy for uncontrolled postpartum bleeding:a systematic review[J].Obstetrics and Gynecology,2010,(03):637-644.