8Nikas G, Psyehoyos A. Uterine pinopodes in peri-implantation human endometrium. Clinical relevance [J]. Ann N Y Acad Sci, 1997,816 : 129-142.
9Kolb BA, Paulson RJ. The luteal phase of cycles utilizing controlled ovarian hyperstimulation and the possible impact of this hyperstimulation on embryo implantation [J]. Am J Obstet Gynecol, 1997, 176(6) : 1262-1267.
10Sher G, Fisch JD. Effect of vaginal sildenafil on the outcome of in ritro fertilization (IVF) after multiple IVF failures attributed to poor endometrial development [J]. Fertil Steril, 2002,78(5) : 1073-1076.
7Dechaud H,Bessueille E,Bousquet PJ,et al.Optimal timing of ul-trasonographic and Doppler evaluation of uterine recep-tivity toimplantation[J].Reprod Biomed Online,2008,16:368-375.
8Puerto B,Creus M,Carinona F,et al.Ultrasonography as a predi-etor of Embryo implantation after in vitro fertilization:aeontrolledstudy[J].Fertility&Sterility,2003,79(4):1015-1022.
9McWilliams GD,Frattarelli JL.Changes in measured endometri-althickness predict in vitro fertilization success[J].Fertil Steril,2007,88(1):74-81.