2Ijaijya MA,Aboyeji AP,Abubakar D. Analysis of 348 consecutive cases of primary postpartum hemorrhage at a tertiary hospital in Nigeria [ J ]. J Obstet Gynaecol, 2003,23 : 374-377.
3Humphrey MD. Isgrand multiparity an independent predictor of pregnancy risk? A retrospective observational study [ J ]. Med J Aust,2003,179 : 294-296.
4Guhnezoglu AM,Hofmeyr GJ. Prevention and treatment of postpartum hemorrhage [ M ]//Maclean AB, Neilson J, eds. Maternal Morbidity and Mortality. London: RCOG Press, 2002.241-251.