1Ribbert LSM,Komman LH,Wolf BTHM,et al.Maternal serum screening for fetal Down syndrome in IVF pregnancies.Prenatal Diagn,1996,16,35-38.
2Ghazi HA,Spielberger C,Kallén B.Delivery outcome after infertility-a registry study.Fertil.Steril,1991,55:726-732.
3Williams MA,Goldman MB,Mittendorf R,et al.Subfertility and the risk of low birth weight.Fertil.Steril.,1991,56:668-671.
4Thompson JG,Gardner DK,Pugh PA et al:Lamb birth weight is affected by culture system utilized during in vitro pre-elongation development of ovine embryos.Biol Reprod,1995,53:1385-1391.
