 The primary outcome was the ovulation rate in each group. Secondary outcomes were the endometrial thickness and serum estradiol pgml, on the day of the hCG injection, midluteal serum progesterone ngml and the rates of clinical pregnancy and first trimester spontaneous abortion. The ovulation rate was calculated as the percentage of ovulatory cycles per total observed cycles. The cumulative pregnancy rate was defined as the number of pregnant patients to the total number of patients. The abortion rate was defined as the percentage of miscarriage during the first 12 weeks of gestation per total pregnancies, while the biochemical miscarriage was considered if pregnancy loss occurred in any confirmed biochemical pregnancy without ultrasound evidence of intrauterine pregnancy. 