When a follicle > 13 mm is detected OR if 6 or more follicles > 10 mm develop and E2 is > 1000 pmol/L, women will be instructed to begin taking a Gonadotropin Releasing Hormone Antagonist (Cetrotide, Serono Canada) and recombinant Luteinizing Hormone (Luveris, Serono Canada). Gonal F, Cetrotide and Luveris administration will continue daily until human Chorionic Gonadotropin (hCG, Pharmaceutical Partners of Canada Inc.) is administered when > 3 follicles reach > 17 mm in diameter. It is anticipated that the duration of ovarian stimulation therapy will be 8-16 days. Shorter or longer stimulation intervals may result in cycle cancellation. Oocytes will be isolated, evaluated and fertilized following hCG administration, according to the normal standard of care.