1Puissant F,Van Rysselberge M,Barlow P,et al.Embryo scoring as aprognostic tool in IVF treatment[J].Hum Reprod,1987,8:705-708.
2TestartJ,Laddalle B,Forman R,et al.Factors influencing the successrate for human embryo freezing in an in vitro fertilization and embyotransfer prosram[J].Fertil Steril,1987,48:107-111.
3Trounson A, Mohr L.Human pregnancy following cryopreservarion,thawing and transfer of an eighr-cell embryo[J].Nature,1983,305:707-709.
