['infertility, female']
['sildenafil vaginal suppositories']

        Inclusion Criteria:

          -  Women with normal ovarian reserve and had at least two prior cycle with FSH <10 mIu/ml

          -  Women with history of two or three prior consecutive failed IVF/ICSI attempts using at
             least two good quality fresh or frozen-thawed embryos.

          -  Endometrial thickness on the day of hCG injection was < 9 mm in all prior IVF/ICSI
             attempts

          -  Women with normal endometrial appearance in hysteroscopy or hysterosonography or
             hysterosalpingography

        Exclusion Criteria:

          -  Women who had history of PCOS, myomectomy, Asherman's Syndrome and mullerian anomalies
      