5Seoud ,MA,Nassar AH,Usta IM, et al. Impact of advanced maternal age on pregnancy outcome[J]. Am J Perinatol,2002,19(1): 1.
6Miletic T,Aberle N,Mikulandra F,et al. Perinatal out come of pregnancies in women aged 40 and over [J].Coil Antropol, 2002,296 (1):251.
7Canterino JC, Ananth CV, Smulian J, et al. Maternal age and risk of fetal death in singleton gestafionsi USA,1995-2000[J].J Matern Fetal Neonatal Med,2004,15:193-197.