Treatment Protocols All women received oral contraceptive for 21 days which started on the first day of previous cycle . In group I , stimulation were performed by administration of clomiphene citrate (Iran hormone, Tehran, Iran) 100 mg from day 3 of withdrawal bleeding until day 7 of cycle and gonadotropin stimulation with 225-300 IU daily , recombinant FSH (r-FSH) SC or hMG IM , were started from day 5 of cycle . In group II ovarian stimulation was initiated with GnRH-agonist , buserelin (Suprefact, Aventis Pharma, Frankfurt, Germany) 50 µg SC twice a day from cycle day 2 of withdrawal bleeding . After two days , 225-300 IU/day recombinant FSH (r-FSH) SC or hMG IM were administered.