The procedure was cancelled if less than 3 follicles ≥17 mm in size are present 12 days after starting FSH despite doses reaching 450 IU. The cycle was also cancelled if there is risk of ovarian hyperstimulation like massive ovarian enlargement or serum estradiol exceeds 3000pg/L The quality of embryos was assessed at day 3 according to the number and evenness of blastomeres in addition to the percentage of fragmentation. Embryos were classified into 3 groups: Excellent embryos containing 6-8 even blastomeres with <10% fragmentation, moderate embryos containing 6-8 even or uneven blastomeres with 10-20% fragmentation, and poor quality embryos containing less than 6 blastomeres or >20% fragmentation.