2Day MC,Barton JR,O'Brien JM,et al.The effect of fetal number on the development of hypertensive conditions of pregnancy[J].Obstet Gynecol,2005,106(5Pt1):927-931.
3Luke B,Brown MB.The changing risk of infant mortality by gestation,plurality,and race:1989-1991 versus 1999-2001[J].Pediatrics,2006,118(6):2488-2497.
4Mansouri HA,Ghazawi AH.The maternal and neonatal outcome of high order gestation at King Abdulaziz University Hospital[J].Arch Gynecol Obstet,2007,275(2):89-92.
5Adegbite AL,Ward BS,Bajoria R.Perinatal outcome of quadruplet pregnancies in relation to chorionicity[J].J Perinatol,2007,27(1):15-21.
6Salihu HM,Bagchi S,Kristensen S,et al.A method for quantifying birthweight discordance in quadruplets and potential use in predicting early mortality[J].Am J Perinatol,2006,23(4):223-228.
7Francois K,Ortiz J,Harris C,et al.Is peripartum hysterectomy more common in multiple gestations[J].Obstet Gynecol,2005,105(6):1369-1372.
